High concentration antibody and protein formulations

ABSTRACT

The present application relates to highly concentrated antibody and protein formulations with reduced viscosity that are stable, relatively isotonic and are of low turbidity. The formulations are particularly suitable for subcutaneous administration. The application further describes articles of manufacture containing such formulations and method for using them to treat disorders treatable by the formulated antibody or protein.

This application is a continuation application of U.S. patentapplication Ser. No. 12/197,005, filed Aug. 22, 2008, which is acontinuation application of U.S. patent application Ser. No. 10/813,483,filed Mar. 29, 2004, which is a non-provisional application claimingpriority to provisional application Ser. No. 60/460,659, filed Apr. 4,2003, the contents of which are incorporated herein by reference intheir entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention pertains to highly concentrated formulations ofantibodies, which are particularly suitable for subcutaneousadministration. The invention further provides stable, highlyconcentrated (e.g., ≧100 mg/ml protein) liquid formulations.

2. Description of the Related Art

There is a significant demand for highly concentrated liquid antibodyformulations. However, highly concentrated protein formulations poseseveral problems. One problem is instability due to the formation ofparticulates. With reconstituted lyophilized preparations to generateliquid formulations, this problem has been addressed through the use ofsurfactants (e.g., a polysorbate), but surfactants are unsuitable forliquid formulations, because they render further processing difficult.Moreover, surfactants further do not reduce the increased viscositycaused as a result of numerous intermolecular interactions from themacromolecular nature of antibodies.

Although surfactants have been shown to significantly reduce the degreeof particulate formation of proteins, they do not address the problem ofincreased viscosity that makes difficult the manipulation andadministration of concentrated antibody formulations. Antibodies tend toform viscous solutions at high concentration because of theirmacromolecular nature and potential for intermolecular interactions.Moreover, pharmaceutically acceptable sugars are often used in largeamounts as stabilizers. Such sugars can enhance the intermolecularinteractions, thereby increasing the viscosity of the formulation.Highly viscous formulations are difficult to manufacture, draw into asyringe and inject subcutaneously. The use of force in manipulating theviscous formulations leads to excessive frothing, which can lead todenaturation and inactivation of active biologics. Satisfactory solutionof this problem is lacking.

While the prior art indicates numerous example of excipients that can besuitably employed to create pharmaceutical formulations, very fewproteins have been successfully formulated above 100 mg/ml, or havetechniques for doing so been described.

Applicants have discovered that Arginine, specifically Arginine-HCl isparticularly suited for highly concentrated liquid protein or antibodyformulations.

Stable isotonic lyophilized protein formulations are disclosed in PCTpublication WO 97/04801, published on Feb. 13, 1997, the entiredisclosure of which is hereby expressly incorporated by reference. Thedisclosed lyophilized formulations can be reconstituted to generate highprotein-concentration liquid formulations without apparent loss ofstability. However, the potential issues associated with the highviscosity of the reconstituted formulations are not addressed. Proteinaggregation has been reduced previously through the addition of sugars,but doing so can dramatically increase the viscosity and osmolarity,thereby rendering processing and use impractical.

Applicants co-pending application U.S. Ser. No. 09/971,511, filed Oct.4, 2001 discloses high protein concentration, but low viscosityformulations achieved: 1) through low pH (about 4.0 to 5.3); 2) high pH(about 6.5 to 12.0), or 3) increasing the total ionic strength of theformulation by the addition of salts or buffers. However, whileincreased ionic strength does decrease the viscosity of the formulation(such as with NaCl), it may also result in increased turbidity of thesolution, which is often associated with the formation of proteinparticles (e.g., aggregation). Thus an optimal high concentrationprotein formulation must overcome challenges of stability, viscosity,osmolarity and turbidity.

SUMMARY OF THE INVENTION

The present invention concerns highly concentrated protein or antibodyformulations that are stable, and of low viscosity and turbidity.

In particular, the present invention concerns highly concentratedantibody formulations of low turbidity comprising protein or antibody(100-260 mg/ml), histidine (10-100 mM), arginine-HCl (50-200 mM) andpolysorbate (0.01%-0.1%), having a pH of 5.5-7.0, a viscosity of 50 csor less and osmolarity from 200 mOsm/kg-450 mOsm/kg. Alternatively, theprotein or antibody in the formulations can range from 120-260 mg/ml,alternatively 150-260 mg/ml, alternatively 180-260 mg/ml, alternatively200-260 mg/ml protein or antibody. Alternatively the osmolarity rangesfrom 250 mOsm/kg-350 mOsm/kg. Alternatively, the concentration ofarginine-HCl ranges from 100-200 mM, alternatively 150-200 mM,alternatively 180-200 mM.

Alternatively, the present invention concerns a highly concentratedantibody formulations of low turbidity comprising antibody (40-150mg/ml), histidine (10-100 mM), sugar (e.g., trehalose or sucrose, 20-350mM) and polysorbate (0.01%-0.1%).

In a particular embodiment, the invention provides a formulationcontaining high concentrations of large molecular weight proteins, suchas antibodies or immunoglobulins. The antibodies may, for example, beantibodies directed against a particular predetermined antigen. In aspecific aspect, the antigen is IgE (e.g., rhuMAbE-25, rhuMAbE-26described in U.S. Pat. No. 6,329,509 and WO 99/01556). Alternatively,the anti-IgE antibody can be CGP-5101 (Hu-901) described in Come et al.,J. Clin. Invest. 99(5): 879-887 (1997), WO92/17207, and ATTC DepositNos. BRL-10706 and 11130, 11131, 11132, 11133. Alternatively, theantigen may include: the CD proteins CD3, CD4, CD8, CD19, CD20, CD34 andCD40; members of the HER receptor family such as EGF receptor, HER2,HER3 or HER4 receptor; 2C4, 4D5, PSCA, LDP-2, cell adhesion moleculessuch as LFA-1, Mac1, p150, 95, VLA-4, ICAM-1, VCAM and αv/β3 integrinincluding the α- and β-subunits thereof (e.g., anti-CD11a, anti-CD18 oranti-CD11b antibodies); growth factors such as VEGF; blood groupantigens; flk2/flt3 receptor; obesity (OB) receptor; mpl receptor,CTLA-4, and protein C.

The formulations of the present invention may be pharmaceuticalformulations. In a specific aspect, the formulation is deliveredsubcutaneously.

In yet another embodiment, the invention provides a method for thetreatment, prophylactic or therapeutic, of a disorder treatable by theprotein or antibody formulated, comprising administering theformulations disclosed herein comprising a therapeutically effectiveamount of the protein or antibody. Such formulations are particularlyuseful for subcutaneous administration. In a specific aspect, thedisorder is an IgE-mediated disorder. In yet a further specific aspect,the IgE-mediated disorder is allergic rhinitis, asthma (e.g., allergicasthma and non-allergic asthma), atopic dermatitis, allergicgastroenteropathy, hypersensitity (e.g., analphylaxis, urticaria, foodallergies etc.), allergic bronchopulmonary aspergillosis, parasiticdiseases, interstitial cystitis, hyper-IgE syndrome,ataxia-telangiectasia, Wiskott-Aldrich syndrome, thymic alymphoplasia,IgE myeloma and graft-versus-host reaction.

In yet another embodiment, the invention provides an article ofmanufacture comprising a container enclosing a formulation disclosedherein. In one aspect, the article of manufacture is pre-filled syringe.In yet another specific aspect, the pre-filled syringe is furthercontaining within an injection device. In yet another specific aspect,the injection device is an auto-injector.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1. Hydrophobic interaction chromatography of a pepsin digestedanti-IgE monoclonal antibody. Samples were formulated at different pHand buffers: (●) 20 mM Acetate, (Δ) 20 mM Succinate, (▴) 20 mM Na₂HPO₄,(∇) 20 mM K₂PO₄ and (*) 20 mM Tris buffer. The samples were stored at30° C. for 6 months.

FIG. 2. Size exclusion chromatography of an anti-IgE monoclonal antibodystored at 40° C. for 6 months. Samples were formulated at different pHand buffers: (▪) 20 mM Glutamate, (●) 20 mM Acetate, (Δ) 20 mMSuccinate, (□) 20 mM Histidine, (▴) 20 mM Na₂HPO₄, (▾) 20 mM K₂PO₄ and(*) 20 mM Tris buffer.

FIG. 3. Activity of an anti-IgE monoclonal antibody stored at 30° C. for6 months. Samples were formulated at different pH and buffers: (●) 20 mMAcetate, (Δ) 20 mM Succinate, (□) 20 mM Histidine, (▴) 20 mM Na₂HPO₄,(▾) 20 mM K₂PO₄ and (*) 20 mM Tris buffer.

FIG. 4. Effects of Polysorbate 20 on turbidity of the stressed anti-IgEmonoclonal antibody. Samples contain 100 mg/ml antibody, 20 mMSuccinate, 192 mM Trehalose and various amounts of polysorbate 20 at pH6.0. The polysorbate concentrations are (▪) 0, (▴) 0.01%, (●) 0.02% and(Δ) 0.05%.

FIG. 5. Turbidity of an anti-IgE monoclonal antibody at ˜150 mg/ml withdifferent excipients (▴) CaCl₂, (∇) MgCl₂ and (Δ) Arginine-HCl

FIG. 6. Turbidity of anti-IgE monoclonal antibody at −150 mg/ml withvarious excipients. The samples were stored at (▴) −70° C., (▪) 2-8° C.,(Δ) 15° C., (□) 30° C. and (∇) 40° C.

FIG. 7. Hydrophobic interaction chromatography analyses of papaindigested anti-IgE monoclonal antibody. Samples were formulated at −150mg/ml with various of excipients and stored at (▾) −70° C., (▪) 2-8° C.,(▴) 15° C., (Δ) 30° C. and (□) 40° C.

FIG. 8. Size exclusion chromatography of anti-IgE monoclonal antibody at˜150 mg/ml in (▪) 200 mM arginine-HCl, 23 mM histidine, pH 6.0 (▴) 182mM arginine-HCl, 20 mM histidine, pH 6.0 (●) 182 mM arginine-HCl, 20 mMhistidine, 91 mM sucrose, pH 6.0 (□) 50 mM MgCl₂, 27 mg/ml trehalose,0.01% acetate, (Δ) 50 mM MgCl₂, 30 mM MgAc₂, 0.01% acetate, and (∘) 50mM MgCl₂, 45 mM MgAc₂, 0.01% acetate. Samples were stored at 30° C. for6 months.

FIG. 9. Hydrophobic interaction chromatography analyses of papaindigested anti-IgE monoclonal antibody. The samples show were formulatedin (▪) 200 mM arginine-HCl, 23 mM histidine, (▴) 182 mM arginine-HCl, 20mM histidine, (●) 182 mM arginine-HCl, 20 mM histidine, 91 mM sucrose,(□) 50 mM MgCl₂, 27 mg/ml trehalose, 0.01% acetate, (Δ) 50 mM MgCl₂, 30mM MgAc₂, 0.01% acetate and (∘) 50 mM MgCl₂, 45 mM MgAc₂, 0.01% acetate.Samples were stored at 30° C. for 6 months.

FIG. 10. Shows a comparison of the full-length sequences both variableand constant chains) of the anti-IgE antibodies E25, E26 and Hu-901. TheCDR regions of Hu-901 is shown by underline. For E25 and E26, the CDRregions as defined by Chothia are shown in boldface, while the CDRregion as defined by Kabat are delineated with brackets. FIG. 10A showsthe light chain sequences of E25, E26 and Hu-901 (SEQ ID NOS:1-3), whileFIG. 10B shows the heavy chain sequences of E25, E26 and Hu-901 (SEQ IDNOS:4-6).

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT I. Definitions

By “protein” is meant a sequence of amino acids for which the chainlength is sufficient to produce the higher levels of tertiary and/orquaternary structure. Thus, proteins are distinguished from “peptides”which are also amino acid-based molecules that do not have suchstructure. Typically, a protein for use herein will have a molecularweight of at least about 15-20 kD, preferably at least about 20 kD.

Examples of proteins encompassed within the definition herein includemammalian proteins, such as, e.g., growth hormone, including humangrowth hormone and bovine growth hormone; growth hormone releasingfactor; parathyroid hormone; thyroid stimulating hormone; lipoproteins;α-1-antitrypsin; insulin A-chain; insulin B-chain; proinsulin; folliclestimulating hormone; calcitonin; luteinizing hormone; glucagon; clottingfactors such as factor VIIIC, factor IX, tissue factor, and vonWillebrands factor; anti-clotting factors such as Protein C; atrialnatriuretic factor; lung surfactant; a plasminogen activator, such asurokinase or tissue-type plasminogen activator (t-PA, e.g., Activase®,TNKase®, Retevase®); bombazine; thrombin; tumor necrosis factor-α and-β; enkephalinase; RANTES (regulated on activation normally T-cellexpressed and secreted); human macrophage inflammatory protein(MIP-1-α); serum albumin such as human serum albumin;mullerian-inhibiting substance; relaxin A-chain; relaxin B-chain;prorelaxin; mouse gonadotropin-associated peptide; DNase; inhibin;activin; vascular endothelial growth factor (VEGF); receptors forhormones or growth factors; an integrin; protein A or D; rheumatoidfactors; a neurotrophic factor such as bone-derived neurotrophic factor(BDNF), neurotrophin-3, -4, -5, or -6 (NT-3, NT-4, NT-5, or NT-6), or anerve growth factor such as NGF-P; platelet-derived growth factor(PDGF); fibroblast growth factor such as aFGF and bFGF; epidermal growthfactor (EGF); transforming growth factor (TGF) such as TGF-α and TGF-β,including TGF-β1, TGF-β2, TGF-β3, TGF-β4, or TGF-β5; insulin-like growthfactor-I and -II (IGF-I and IGF-II); des(1-3)-IGF-I (brain IGF-I);insulin-like growth factor binding proteins; CD proteins such as CD3,CD4, CD8, CD19 and CD20; erythropoietin (EPO); thrombopoietin (TPO);osteoinductive factors; immunotoxins; a bone morphogenetic protein(BMP); an interferon such as interferon-α, -β, and -γ; colonystimulating factors (CSFs), e.g., M-CSF, GM-CSF, and G-CSF; interleukins(ILs), e.g., IL-1 to IL-10; superoxide dismutase; T-cell receptors;surface membrane proteins; decay accelerating factor (DAF); a viralantigen such as, for example, a portion of the AIDS envelope; transportproteins; homing receptors; addressins; regulatory proteins;immunoadhesins; antibodies; and biologically active fragments orvariants of any of the above-listed polypeptides.

The protein which is formulated is preferably essentially pure anddesirably essentially homogeneous (i.e. free from contaminatingproteins). “Essentially pure” protein means a composition comprising atleast about 90% by weight of the protein, based on total weight of thecomposition, preferably at least about 95% by weight. “Essentiallyhomogeneous” protein means a composition comprising at least about 99%by weight of protein, based on total weight of the composition.

In certain embodiments, the protein is an antibody. The antibody maybind to any of the above-mentioned molecules, for example. Exemplarymolecular targets for antibodies encompassed by the present inventioninclude IgE, the CD proteins CD3, CD4, CD8, CD19, CD20, CD34 and CD40;members of the HER receptor family such as EGF receptor, HER2, HER3 orHER4 receptor; 2c4, 4D5, PSCA, LDP-2, cell adhesion molecules such asLFA-1, Mac1, p150, 95, VLA-4, ICAM-1, VCAM and αv/β3 integrin includingthe α- and β-subunits thereof (e.g., anti-CD11a, anti-CD18 or anti-CD11bantibodies); growth factors such as VEGF; blood group antigens;flk2/flt3 receptor; obesity (OB) receptor; mpl receptor, CTLA-4, andprotein C.

Additional antibodies that can be made with the formulation describedherein include those that specifically bind to the antigenic targetsdisclosed in the following patent applications: U.S. Ser. No.10/177,488, filed 19 Jun. 2002; U.S. Ser. No. 09/888,257, filed 22 Jun.2001; U.S. Ser. No. 09/929,769, filed 14 Aug. 2001; U.S. Ser. No.09/938,418, filed 23 Aug. 2001; U.S. Ser. No. 10/241,220, filed 11 Sep.2002; U.S. Ser. No. 10/331,496, filed 30 Dec. 2002; U.S. Ser. No.10/125,166, filed 17 Apr. 2002; U.S. Ser. No. 10/127,966, filed 23 Apr.2002; U.S. Ser. No. 10/272,051, filed 16 Oct. 2002; U.S. Ser. No.60/299,500, filed 20 Jun. 2001; U.S. Ser. No. 60/300,880, filed 25 Jun.2001; U.S. Ser. No. 60/301,880, filed 29 Jun. 2001; U.S. Ser. No.60/304,813, filed 11 Jul. 2001; U.S. Ser. No. 60/312,312, filed 13 Aug.2001; U.S. Ser. No. 60/314,280, filed 22 Aug. 2001; U.S. Ser. No.60/323,268, filed 18 Sep. 2001; U.S. Ser. No. 60/339,227, filed 19 Oct.2001; U.S. Ser. No. 60/336,827, filed 7 Nov. 2001; U.S. Ser. No.60/331,906, filed 20 Nov. 2001; U.S. Ser. No. 60/354,444, filed 2 Jan.2002; U.S. Ser. No. 60/351,885, filed 25 Jan. 2002; U.S. Ser. No.60/360,066, filed 25 Feb. 2002; U.S. Ser. No. 60/362,004, filed 5 Mar.2002; U.S. Ser. No. 60/366,869, filed 20 Mar. 2002; U.S. Ser. No.60/366,284, filed 21 Mar. 2002; U.S. Ser. No. 60/368,679, filed 28 Mar.2002; U.S. Ser. No. 60/369,724, filed 3 Apr. 2002; U.S. Ser. No.60/373,160, filed 16 Apr. 2002; U.S. Ser. No. 60/378,885, filed 8 May2002; U.S. Ser. No. 60/404,809, filed 19 Aug. 2002; U.S. Ser. No.60/405,645, filed 21 Aug. 2002; U.S. Ser. No. 60/407,087, filed 29 Aug.2002; U.S. Ser. No. 60/413,192, filed 23 Sep. 2002; U.S. Ser. No.60/419,008, filed 15 Oct. 2002; U.S. Ser. No. 60/426,847, filed 15 Nov.2002; U.S. Ser. No. 60/431,250, filed 6 Dec. 2002; U.S. Ser. No.60/437,344, filed 31 Dec. 2002, U.S. Ser. No. 60/414,971, filed 2 Oct.2002, U.S. Ser. No. 60/418,988, filed 18 Oct. 2002 and 60/445,396, filed5 Feb. 2003.

The term “antibody” as used wherein includes monoclonal antibodies(including full length antibodies which have an immunoglobulin Fcregion), antibody compositions with polyepitopic specificity,multispecific antibodies (e.g., bispecific antibodies, diabodies, andsingle-chain molecules, as well as antibody fragments (e.g., Fab,F(ab′)₂, and Fv). The term “immunoglobulin” (Ig) is used interchangeablywith “antibody” herein.

The basic 4-chain antibody unit is a heterotetrameric glycoproteincomposed of two identical light (L) chains and two identical heavy (H)chains. An IgM antibody consists of 5 of the basic heterotetramer unitalong with an additional polypeptide called a J chain, and contains 10antigen binding sites, while IgA antibodies comprise from 2-5 of thebasic 4-chain units which can polymerize to form polyvalent assemblagesin combination with the J chain. In the case of IgGs, the 4-chain unitis generally about 150,000 daltons. Each L chain is linked to an H chainby one covalent disulfide bond, while the two H chains are linked toeach other by one or more disulfide bonds depending on the H chainisotype. Each H and L chain also has regularly spaced intrachaindisulfide bridges. Each H chain has at the N-terminus, a variable domain(V_(H)) followed by three constant domains (C_(H)) for each of the α andγ chains and four C_(H) domains for μ and ε isotypes. Each L chain hasat the N-terminus, a variable domain (V_(L)) followed by a constantdomain at its other end. The V_(L) is aligned with the V_(H) and theC_(L) is aligned with the first constant domain of the heavy chain(C_(H)1). Particular amino acid residues are believed to form aninterface between the light chain and heavy chain variable domains. Thepairing of a V_(H) and V_(L) together forms a single antigen-bindingsite. For the structure and properties of the different classes ofantibodies, see e.g., Basic and Clinical Immunology, 8th Edition, DanielP. Sties, Abba I. Ten and Tristram G. Parsolw (eds), Appleton & Lange,Norwalk, Conn., 1994, page 71 and Chapter 6.

The L chain from any vertebrate species can be assigned to one of twoclearly distinct types, called kappa and lambda, based on the amino acidsequences of their constant domains. Depending on the amino acidsequence of the constant domain of their heavy chains (CH),immunoglobulins can be assigned to different classes or isotypes. Thereare five classes of immunoglobulins: IgA, IgD, IgE, IgG and IgM, havingheavy chains designated α, δ, ε, γ and μ, respectively. The γ and μclasses are further divided into subclasses on the basis of relativelyminor differences in the CH sequence and function, e.g., humans expressthe following subclasses: IgG1, IgG2, IgG3, IgG4, IgA1 and IgA2.

The term “variable” refers to the fact that certain segments of thevariable domains differ extensively in sequence among antibodies. The Vdomain mediates antigen binding and defines the specificity of aparticular antibody for its particular antigen. However, the variabilityis not evenly distributed across the entire span of the variabledomains. Instead, the V regions consist of relatively invariantstretches called framework regions (FRs) of about 15-30 amino acidresidues separated by shorter regions of extreme variability called“hypervariable regions” or sometimes “complementarity determiningregions” (CDRs) that are each approximately 9-12 amino acid residues inlength. The variable domains of native heavy and light chains eachcomprise four FRs, largely adopting a β-sheet configuration, connectedby three hypervariable regions, which form loops connecting, and in somecases forming part of, the β-sheet structure. The hypervariable regionsin each chain are held together in close proximity by the FRs and, withthe hypervariable regions from the other chain, contribute to theformation of the antigen binding site of antibodies (see Kabat et al.,Sequences of Proteins of Immunological Interest, 5th Ed. Public HealthService, National Institutes of Health, Bethesda, Md. (1991). Theconstant domains are not involved directly in binding an antibody to anantigen, but exhibit various effector functions, such as participationof the antibody dependent cellular cytotoxicity (ADCC).

The term “hypervariable region” (also known as “complementaritydetermining regions” or CDRs) when used herein refers to the amino acidresidues of an antibody which are (usually three or four short regionsof extreme sequence variability) within the V-region domain of animmunoglobulin which form the antigen-binding site and are the maindeterminants of antigen specificity. There are at least two methods foridentifying the CDR residues: (1) An approach based on cross-speciessequence variability (i.e., Kabat et al., Sequences of Proteins ofImmunological Interest (National Institute of Health, Bethesda, Miss.1991); and (2) An approach based on crystallographic studies ofantigen-antibody complexes (Chothia, C. et al., J. Mol. Biol. 196:901-917 (1987)). However, to the extent that two residue identificationtechniques define regions of overlapping, but not identical regions,they can be combined to define a hybrid CDR.

The term “monoclonal antibody” as used herein refers to an antibodyobtained from a population of substantially homogeneous antibodies,i.e., the individual antibodies comprising the population are identicalexcept for possible naturally occurring mutations and/orpost-translation modifications (e.g., isomerizations, amidations) thatmay be present in minor amounts. Monoclonal antibodies are highlyspecific, being directed against a single antigenic site. Furthermore,in contrast to conventional (polyclonal) antibody preparations whichtypically include different antibodies directed against differentdeterminants (epitopes), each monoclonal antibody is directed against asingle determinant on the antigen. In addition to their specificity, themonoclonal antibodies are advantageous in that they are synthesized bythe hybridoma culture, uncontaminated by other immunoglobulins. Themodifier “monoclonal” indicates the character of the antibody as beingobtained from a substantially homogeneous population of antibodies, andis not to be construed as requiring production of the antibody by anyparticular method. For example, the monoclonal antibodies to be used inaccordance with the present invention may be made by the hybridomamethod first described by Kohler et al., Nature, 256: 495 (1975), or maybe made by recombinant DNA methods (see, e.g., U.S. Pat. No. 4,816,567).The “monoclonal antibodies” may also be isolated from phage antibodylibraries using the techniques described in Clackson et al., Nature,352:624-628 (1991) and Marks et al., J. Mol. Biol., 222:581-597 (1991),for example.

The monoclonal antibodies herein specifically include “chimeric”antibodies (immunoglobulins) in which a portion of the heavy and/orlight chain is identical with or homologous to corresponding sequencesin antibodies derived from a particular species or belonging to aparticular antibody class or subclass, while the remainder of thechain(s) is(are) identical with or homologous to corresponding sequencesin antibodies derived from another species or belonging to anotherantibody class or subclass, as well as fragments of such antibodies, solong as they exhibit the desired biological activity (U.S. Pat. No.4,816,567; Morrison et al., Proc. Natl. Acad. Sci. USA, 81:6851-6855(1984)). Chimeric antibodies of interest herein include “primitized”antibodies comprising variable domain antigen-binding sequences derivedfrom a non-human primate (e.g., Old World Monkey, Ape etc.) and humancontant region sequences.

An “intact” antibody is one which comprises an antigen-binding site aswell as a CL and at least the heavy chain domains, C_(H)1, C_(H)2 andC_(H)3. The constant domains may be native sequence constant domains(e.g., human native sebquence constant domains) or amino acid sequencevariants thereof. Preferably, the intact antibody has one or moreeffector functions.

An “antibody fragment” comprises a portion of an intact antibody,preferably the antigen binding and/or the variable region of the intactantibody. Examples of antibody fragments include Fab, Fab′, F(ab′)₂ andFv fragments; diabodies; linear antibodies (see U.S. Pat. No. 5,641,870,Example 2; Zapata et al., Protein Eng. 8(10): 1057-1062 [1995]);single-chain antibody molecules and multispecific antibodies formed fromantibody fragments.

Papain digestion of antibodies produced two identical antigen-bindingfragments, called “Fab” fragments, and a residual “Fc” fragment, adesignation reflecting the ability to crystallize readily. The Fabfragment consists of an entire L chain along with the variable regiondomain of the H chain (V_(H)), and the first constant domain of oneheavy chain (C_(H)1). Each Fab fragment is monovalent with respect toantigen binding, i.e., it has a single antigen-binding site. Pepsintreatment of an antibody yields a single large F(ab′)₂ fragment whichroughly corresponds to two disulfide linked Fab fragments havingdifferent antigen-binding activity and is still capable of cross-linkingantigen. Fab′ fragments differ from Fab fragments by having a fewadditional residues at the carboxy terminus of the C_(H)1 domainincluding one or more cysteines from the antibody hinge region. Fab′-SHis the designation herein for Fab′ in which the cysteine residue(s) ofthe constant domains bear a free thiol group. F(ab′)₂ antibody fragmentsoriginally were produced as pairs of Fab′ fragments which have hingecysteines between them. Other chemical couplings of antibody fragmentsare also known.

The Fc fragment comprises the carboxy-terminal portions of both H chainsheld together by disulfides. The effector functions of antibodies aredetermined by sequences in the Fc region, the region which is alsorecognized by Fc receptors (FcR) found on certain types of cells.

“Fv” is the minimum antibody fragment which contains a completeantigen-recognition and -binding site. This fragment consists of a dimerof one heavy- and one light-chain variable region domain in tight,non-covalent association. From the folding of these two domains emanatesix hypervarible loops (3 loops each from the H and L chain) thatcontribute the amino acid residues for antigen binding and conferantigen binding specificity to the antibody. However, even a singlevariable domain (or half of an Fv comprising only three CDRs specificfor an antigen) has the ability to recognize and bind antigen, althoughat a lower affinity than the entire binding site.

“Single-chain Fv” also abbreviated as “sFv” or “scFv” are antibodyfragments that comprise the VH and VL antibody domains connected into asingle polypeptide chain. Preferably, the sFv polypeptide furthercomprises a polypeptide linker between the V_(H) and V_(L) domains whichenables the sFv to form the desired structure for antigen binding. For areview of the sFv, see Pluckthun in The Pharmacology of MonoclonalAntibodies, vol. 113, Rosenburg and Moore eds., Springer-Verlag, NewYork, pp. 269-315 (1994).

The term “diabodies” refers to small antibody fragments prepared byconstructing sFv fragments (see preceding paragraph) with short linkers(about 5-10) residues) between the V_(H) and V_(L) domains such thatinter-chain but not intra-chain pairing of the V domains is achieved,thereby resulting in a bivalent fragment, i.e., a fragment having twoantigen-binding sites. Bispecific diabodies are heterodimers of two“crossover” sFv fragments in which the V_(H) and V_(L) domains of thetwo antibodies are present on different polypeptide chains. Diabodiesare described in greater detail in, for example, EP 404,097; WO93/11161; Hollinger et al., Proc. Natl. Acad. Sci. USA 90: 6444-6448(1993).

An antibody that “specifically binds to” or is “specific for” aparticular polypeptide or an epitope on a particular polypeptide is onethat binds to that particular polypeptide or epitope on a particularpolypeptide without substantially binding to any other polypeptide orpolypeptide epitope.

The term “solid phase” describes a non-aqueous matrix to which theantibody of the present invention can adhere. Examples of solid phasesencompassed herein include those formed partially or entirely of glass(e.g., controlled pore glass), polysaccharides (e.g., agarose),polyacrylamides, polystyrene, polyvinyl alcohol and silicones. Incertain embodiments, depending on the context, the solid phase cancomprise the well of an assay plate; in others it is a purificationcolumn (e.g., an affinity chromotography column). This term alsoincludes a discontinuous solid phase of discrete particles, such asthose described in U.S. Pat. No. 4,275,149.

“Humanized” forms of non-human (e.g., murine) antibodies are chimericimmunoglobulins, immunoglobulin chains or fragments thereof (such as Fv,Fab, Fab′, F(ab′)₂ or other antigen-binding subsequences of antibodies)of mostly human sequences, which contain minimal sequence derived fromnon-human immunoglobulin. For the most part, humanized antibodies arehuman immunoglobulins (recipient antibody) in which residues from ahypervariable region (also CDR) of the recipient are replaced byresidues from a hypervariable region of a non-human species (donorantibody) such as mouse, rat or rabbit having the desired specificity,affinity, and capacity. In some instances, Fv framework region (FR)residues of the human immunoglobulin are replaced by correspondingnon-human residues. Furthermore, “humanized antibodies” as used hereinmay also comprise residues which are found neither in the recipientantibody nor the donor antibody. These modifications are made to furtherrefine and optimize antibody performance. The humanized antibodyoptimally also will comprise at least a portion of an immunoglobulinconstant region (Fc), typically that of a human immunoglobulin. Forfurther details, see Jones et al., Nature, 321:522-525 (1986); Reichmannet al., Nature, 332:323-329 (1988); and Presta, Curr. Op. Struct. Biol.,2:593-596 (1992).

A “species-dependent antibody”, e.g. a mammalian anti-human IgEantibody, is an antibody which has a stronger binding affinity for anantigen from a first mammalian species than it has for a homologue ofthat antigen from a second mammalian species. Normally, thespecies-dependent antibody “bind specifically” to a human antigen (i.e.,has a binding affinity (Kd) value of no more than about 1×10⁻⁷ M,alternatively no more than about 1×. 10⁻⁸ M, alternatively no more thanabout 1×10⁻⁹ M) but has a binding affinity for a homologue of theantigen from a second non-human mammalian species which is at leastabout 50 fold, at least about 500 fold, or at least about 1000 fold,waker than it binding affinity for the non-human antigen. Thespecies-dependent antibody can be of any of the various types ofantibodies as defined above, but preferably is a humanized or humanantibody.

Antibody “effector functions” refer to those biological activitiesattributable to the Fc region (a native sequence Fc region or amino acidsequence variant Fc region) of an antibody, and vary with the antibodyisotype. Examples of antibody effector functions include: C1q bindingand complement dependent cytotoxicity; Fc receptor binding;antibody—dependent cell-mediated cytotoxicity (ADCC); phagocytosis; downregulation of cell surface receptors (e.g., B cell receptors); and Bcell activation.

“Antibody-dependent cell-mediated cytotoxicity” or ADCC refers to a formof cytotoxicity in which secreted Ig bound onto Fc receptors (FcRs)present on certain cytotoxic cells (e.g., natural killer (NK) cells,neutrophils and macrophages) enable these cytotoxic effector cells tobind specifically to an antigen-bearing target cell and subsequentlykill the target cell with cytotoxins. The antibodies “arm” the cytotoxiccells and are required for killing of the target cell by this mechanism.The primary cells for mediating ADCC, NK cells, express FcγRIII only,whereas monocytes express FcγRI, FcγRII and FcγRIII. Fc expression onhematopoietic cells is summarized in Table 3 on page 464 of Ravetch andKinet, Annu. Rev. Immunol. 9: 457-92 (1991). To assess ADCC activity ofa molecule of interest, an in vitro ACDD assay, such as that describedin U.S. Pat. No. 5,500,362 or U.S. Pat. No. 5,821,337 may be performed.Useful effector cells for such assays include peripheral bloodmononuclear cells (PBMC) and natural killer (NK) cells. Alternatively,or additionally, ADCC activity of the molecule of interest may beassessed in vivo, e.g., in an animal model such as that disclosed inClynes et al., PNAS USA 95:652-656 (1998).

“Fc receptor” or “FcR” describes a receptor that binds to the Fc regionof an antibody. The preferred FcR is a native sequence human FcR.Moreover, a preferred FcR is one which binds an IgG antibody (a gammareceptor) and includes receptors of the FcγRI, FcγRII, and FcγRIIIsubclasses, including allelic variants and alternatively spliced formsof these receptors, FcγRII receptors include FcγRIIA (an “activatingreceptor”) and FcγRIIB (an “inhibiting receptor”), which have similaramino acid sequences that differ Primarily in the cytoplasmic domainsthereof. Activating receptor FcγRIIA contains an immunoreceptortyrosine-based activation motif (ITAM) in its cytoplasmic domain.Inhibiting receptor FcγRIIB contains an immunoreceptor tyrosine-basedinhibition motif (ITEM) in its cytoplasmic domain. (see M. Daëron, Annu.Rev. Immunol. 15:203-234 (1997). FcRs are reviewed in Ravetch and Kinet,Annu. Rev. Immunol. 9: 457-92 (1991); Capel et al., Immunomethods 4:25-34 (1994); and de Haas et al., J. Lab. Clin. Med. 126: 330-41 (1995).Other FcRs, including those to be identified in the future, areencompassed by the term “FcR” herein. The term also includes theneonatal receptor, FcRn, which is responsible for the transfer ofmaternal IgGs to the fetus. Guyer et al., J. Immunol. 117: 587 (1976)and Kim et al., J. Immunol. 24: 249 (1994).

“Human effector cells” are leukocytes which express one or more FcRs andperform effector functions. Preferably, the cells express at leastFcγRIII and perform ADCC effector function. Examples of human leukocyteswhich mediate ADCC include peripheral blood mononuclear cells (PBMC),natural killer (NK) cells, monocytes, cytotoxic T cells and neutrophils,with PBMCs and MNK cells being preferred. The effector cells may beisolated from a native source, e.g., blood.

“Complement dependent cytotoxicity” of “CDC” refers to the lysis of atarget cell in the presence of complement. Activation of the classicalcomplement pathway is initiated by the binding of the first component ofthe complement system (C1q) to antibodies (of the appropriate subclass)which are bound to their cognate antigen. To assess complementactivation, a CDC assay, e.g., as described in Gazzano-Santoro et al.,J. Immunol. Methods 202: 163 (1996), may be performed.

“Isolated” when used to describe the various polypeptides and antibodiesdisclosed herein, means a polypeptide or antibody that has beenidentified, separated and/or recovered from a component of itsproduction environment. Preferably, the isolated polypeptide is free ofassociation with all other components from its production environment.Contaminant components of its production environment, such as thatresulting from recombinant transfected cells, are materials that wouldtypically interfere with diagnostic or therapeutic uses for thepolypeptide, and may include enzymes, hormones, and other proteinaceousor non-proteinaceous solutes. In preferred embodiments, the polypeptidewill be purified (1) to a degree sufficient to obtain at least 15residues of N-terminal or internal amino acid sequence by use of aspinning cup sequenator, or (2) to homogeneity by SDS-PAGE undernon-reducing or reducing conditions using Coomassie blue or, preferably,silver stain. Ordinarily, however, an isolated polypeptide or antibodywill be prepared by at least one purification step.

An “isolated” nucleic acid molecule encoding the polypeptides andantibodies herein is a nucleic acid molecule that is identified andseparated from at least one contaminant nucleic acid molecule with whichit is ordinarily associated in the environment in which it was produced.Preferably, the isolated nucleic acid is free of association with allcomponents associated with the production environment. The isolatednucleic acid molecules encoding the polypeptides and antibodies hereinis in a form other than in the form or setting in which it is found innature. Isolated nucleic acid molecules therefore are distinguished fromnucleic acid encoding the polypeptides and antibodies herein existingnaturally in cells.

The term “control sequences” refers to DNA sequences necessary for theexpression of an operably linked coding sequence in a particular hostorganism. The control sequences that are suitable for prokaryotes, forexample, include a promoter, optionally an operator sequence, and aribosome binding site. Eukaryotic cells are known to utilize promoters,polyadenylation signals, and enhancers.

Nucleic acid is “operably linked” when it is placed into a functionalrelationship with another nucleic acid sequence. For example, DNA for apresequence or secretory leader is operably linked to DNA for apolypeptide if it is expressed as a preprotein that participates in thesecretion of the polypeptide; a promoter or enhancer is operably linkedto a coding sequence if it affects the transcription of the sequence; ora ribosome binding site is operably linked to a coding sequence if it ispositioned so as to facilitate translation. Generally, “operably linked”means that the DNA sequences being linked are contiguous, and, in thecase of a secretory leader, contiguous and in reading phase. However,enhancers do not have to be contiguous. Linking is accomplished byligation at convenient restriction sites. If such sites do not exist,the synthetic oligonucleotide adaptors or linkers are used in accordancewith conventional practice.

The term “epitope tagged” when used herein refers to a chimericpolypeptide comprising a polypeptide or antibody described herein fusedto a “tag polypeptide”. The tag polypeptide has enough residues toprovide an epitope against which an antibody can be made, yet is shortenough such that it does not interfere with activity of the polypeptideto which it is fused. The tag polypeptide preferably also is fairlyunique so that the antibody does not substantially cross-react withother epitopes. Suitable tag polypeptides generally have at least sixamino acid residues and usually between about 8 and 50 amino acidresidues (preferably, between about 10 and 20 amino acid residues).

As used herein, the term “immunoadhesin” designates antibody-likemolecules which combine the binding specificity of a heterologousprotein (an “adhesin”) with the effector functions of immunoglobulinconstant domains. Structurally, the immunoadhesins comprise a fusion ofan amino acid sequence with the desired binding specificity which isother than the antigen recognition and binding site of an antibody(i.e., is “heterologous”), and an immunoglobulin constant domainsequence. The adhesin part of an immunoadhesin molecule typically is acontiguous amino acid sequence comprising at least the binding site of areceptor or a ligand. The immunoglobulin constant domain sequence in theimmunoadhesin may be obtained from any immunoglobulin, such as IgG-1,IgG-2, IgG-3, or IgG-4 subtypes, IgA (including IgA-1 and IgA-2), IgE,IgD or IgM. The Ig fusions preferably include the substitution of adomain of a polypeptide or antibody described herein in the place of atleast one variable region within an Ig molecule. In a particularlypreferred embodiment, the immunoglobulin fusion includes the hinge, CH2and CH3, or the hinge, CH1, CH2 and CH3 regions of an IgG1 molecule. Forthe production of immunoglobulin fusions see also U.S. Pat. No.5,428,130 issued Jun. 27, 1995.

A “stable” formulation is one in which the protein therein essentiallyretains its physical and chemical stability and integrity upon storage.Various analytical techniques for measuring protein stability areavailable in the art and are reviewed in Peptide and Protein DrugDelivery, 247-301, Vincent Lee Ed., Marcel Dekker, Inc., New York, N.Y.,Pubs. (1991) and Jones, A. Adv. Drug Delivery Rev. 10: 29-90 (1993).Stability can be measured at a selected temperature for a selected timeperiod. For rapid screening, the formulation may be kept at 40° C. for 2weeks to 1 month, at which time stability is measured. Where theformulation is to be stored at 2-8° C., generally the formulation shouldbe stable at 30° C. or 40° C. for at least 1 month and/or stable at 2-8°C. for at least 2 years. Where the formulation is to be stored at 30°C., generally the formulation should be stable for at least 2 years at30° C. and/or stable at 40° C. for at least 6 months. For example, theextent of aggregation during storage can be used as an indicator ofprotein stability. Thus, a “stable” formulation may be one wherein lessthan about 10% and preferably less than about 5% of the protein arepresent as an aggregate in the formulation. In other embodiments, anyincrease in aggregate formation during storage of the formulation can bedetermined.

A “reconstituted” formulation is one which has been prepared bydissolving a lyophilized protein or antibody formulation in a diluentsuch that the protein throughout. The reconstituted formulation issuitable for administration (e.g. parenteral administration) to apatient to be treated with the protein of interest and, in certainembodiments of the invention, may be one which is suitable forsubcutaneous administration.

An “isotonic” formulation is one which has essentially the same osmoticpressure as human blood. Isotonic formulations will generally have anosmotic pressure from about 250 to 350 mOsm. The term “hypotonic”describes a formulation with an osmotic pressure below that of humanblood. Correspondingly, the term “hypertonic” is used to describe aformulation with an osmotic pressure above that of human blood.Isotonicity can be measured using a vapor pressure or ice-freezing typeosmometer, for example. The formulations of the present invention arehypertonic as a result of the addition of salt and/or buffer.

A “reconstituted” formulation is one which has been prepared bydissolving a lyophilized protein formulation in a diluent such that theprotein is dispersed in the reconstituted formulation. The reconstitutedformulation is suitable for administration (e.g. parenteraladministration) to a patient to be treated with the protein of interestand, in certain embodiments of the invention, may be one which issuitable for subcutaneous administration.

A “pharmaceutically acceptable acid” includes inorganic and organicacids which are non toxic at the concentration and manner in which theyare formulated. For example, suitable inorganic acids includehydrochloric, perchloric, hydrobromic, hydroiodic, nitric, sulfuric,sulfonic, sulfinic, sulfanilic, phosphoric, carbonic, etc. Suitableorganic acids include straight and branched-chain alkyl, aromatic,cyclic, cyloaliphatic, arylaliphatic, heterocyclic, saturated,unsaturated, mono, di- and tri-carboxylic, including for example,formic, acetic, 2-hydroxyacetic, trifluoroacetic, phenylacetic,trimethylacetic, t-butyl acetic, anthranilic, propanoic,2-hydroxypropanoic, 2-oxopropanoic, propandioic, cyclopentanepropionic,cyclopentane propionic, 3-phenylpropionic, butanoic, butandioic,benzoic, 3-(4-hydroxybenzoyl)benzoic, 2-acetoxy-benzoic, ascorbic,cinnamic, lauryl sulfuric, stearic, muconic, mandelic, succinic,embonic, fumaric, malic, maleic, hydroxymaleic, malonic, lactic, citric,tartaric, glycolic, glyconic, gluconic, pyruvic, glyoxalic, oxalic,mesylic, succinic, salicylic, phthalic, palmoic, palmeic, thiocyanic,methanesulphonic, ethanesulphonic, 1,2-ethanedisulfonic,2-hydroxyethanesulfonic, benzenesulphonic, 4-chorobenzenesulfonic,napthalene-2-sulphonic, p-toluenesulphonic, camphorsulphonic,4-methylbicyclo[2.2.2]-oct-2-ene-1-carboxylic, glucoheptonic,4,4′-methylenebis-3-(hydroxy-2-ene-1-carboxylic acid), hydroxynapthoic.

“Pharmaceutically-acceptable bases” include inorganic and organic baseswere are non-toxic at the concentration and manner in which they areformulated. For example, suitable bases include those formed frominorganic base forming metals such as lithium, sodium, potassium,magnesium, calcium, ammonium, iron, zinc, copper, manganese, aluminum,N-methylglucamine, morpholine, piperidine and organic nontoxic basesincluding, primary, secondary and tertiary amine, substituted amines,cyclic amines and basic ion exchange resins, [e.g., N(R′)₄ ⁺ (where R′is independently H or C₁₋₄ alkyl, e.g., ammonium, Tris)], for example,isopropylamine, trimethylamine, diethylamine, triethylamine,tripropylamine, ethanolamine, 2-diethylaminoethanol, trimethamine,dicyclohexylamine, lysine, arginine, histidine, caffeine, procaine,hydrabamine, choline, betaine, ethylenediamine, glucosamine,methylglucamine, theobromine, purines, piperazine, piperidine,N-ethylpiperidine, polyamine resins and the like. Particularly preferredorganic non-toxic bases are isopropylamine, diethylamine, ethanolamine,trimethamine, dicyclohexylamine, choline, and caffeine.

Additional pharmaceutically acceptable acids and bases useable with thepresent invention include those which are derived from the amino acids,for example, histidine, glycine, phenylalanine, aspartic acid, glutamicacid, lysine and asparagine.

“Pharmaceutically acceptable” buffers and salts include those derivedfrom both acid and base addition salts of the above indicated acids andbases. Specific buffers and or salts include histidine, succinate andacetate.

A “lyoprotectant” is a molecule which, when combined with a protein ofinterest, significantly prevents or reduces chemical and/or physicalinstability of the protein upon lyophilization and subsequent storage.Exemplary lyoprotectants include sugars and their corresponding sugaralchohols; an amino acid such as monosodium glutamate or histidine; amethylamine such as betaine; a lyotropic salt such as magnesium sulfate;a polyol such as trihydric or higher molecular weight sugar alcohols,e.g. glycerin, dextran, erythritol, glycerol, arabitol, xylitol,sorbitol, and mannitol; propylene glycol; polyethylene glycol;Pluronics®; and combinations thereof. Additional exemplarylyoprotectants include glycerin and gelatin, and the sugars mellibiose,melezitose, raffinose, mannotriose and stachyose. Examples of reducingsugars include glucose, maltose, lactose, maltulose, iso-maltulose andlactulose. Examples of non-reducing sugars include non-reducingglycosides of polyhydroxy compounds selected from sugar alcohols andother straight chain polyalcohols. Preferred sugar alcohols aremonoglycosides, especially those compounds obtained by reduction ofdisaccharides such as lactose, maltose, lactulose and maltulose. Theglycosidic side group can be either glucosidic or galactosidic.Additional examples of sugar alcohols are glucitol, maltitol, lactitoland iso-maltulose. The preferred lyoprotectant are the non-reducingsugars trehalose or sucrose.

The lyoprotectant is added to the pre-lyophilized formulation in a“lyoprotecting amount” which means that, following lyophilization of theprotein in the presence of the lyoprotecting amount of thelyoprotectant, the protein essentially retains its physical and chemicalstability and integrity upon lyophilization and storage.

In preparing the reduced viscosity formulations of the invention, careshould be taken using the above enumerated excipients as well as otheradditives, especially when added at high concentration, so as to notincrease the viscosity of the formulation.

A “pharmaceutically acceptable sugar” is a molecule which, when combinedwith a protein of interest, significantly prevents or reduces chemicaland/or physical instability of the protein upon storage. When theformulation is intended to be lyophilized and then reconstituted,“pharmaceutically acceptable sugars” may also be known as a“lyoprotectant”. Exemplary sugars and their corresponding sugar alcoholsincludes: an amino acid such as monosodium glutamate or histidine; amethylamine such as betaine; a lyotropic salt such as magnesium sulfate;a polyol such as trihydric or higher molecular weight sugar alcohols,e.g. glycerin, dextran, erythritol, glycerol, arabitol, xylitol,sorbitol, and mannitol; propylene glycol; polyethylene glycol;Pluronics®; and combinations thereof. Additional exemplarylyoprotectants include glycerin and gelatin, and the sugars mellibiose,melezitose, raffinose, mannotriose and stachyose. Examples of reducingsugars include glucose, maltose, lactose, maltulose, iso-maltulose andlactulose. Examples of non-reducing sugars include non-reducingglycosides of polyhydroxy compounds selected from sugar alcohols andother straight chain polyalcohols. Preferred sugar alcohols aremonoglycosides, especially those compounds obtained by reduction ofdisaccharides such as lactose, maltose, lactulose and maltulose. Theglycosidic side group can be either glucosidic or galactosidic.Additional examples of sugar alcohols are glucitol, maltitol, lactitoland iso-maltulose. The preferred pharmaceutically-acceptable sugars arethe non-reducing sugars trehalose or sucrose.

Pharmaceutically acceptable sugars are added to the formulation in a“protecting amount” (e.g. pre-lyophilization) which means that theprotein essentially retains its physical and chemical stability andintegrity during storage (e.g., after reconstitution and storage).

The “diluent” of interest herein is one which is pharmaceuticallyacceptable (safe and non-toxic for administration to a human) and isuseful for the preparation of a liquid formulation, such as aformulation reconstituted after lyophilization. Exemplary diluentsinclude sterile water, bacteriostatic water for injection (BWFI), a pHbuffered solution (e.g. phosphate-buffered saline), sterile salinesolution, Ringer's solution or dextrose solution. In an alternativeembodiment, diluents can include aqueous solutions of salts and/orbuffers.

A “preservative” is a compound which can be added to the formulationsherein to reduce bacterial activity. The addition of a preservative may,for example, facilitate the production of a multi-use (multiple-dose)formulation. Examples of potential preservatives includeoctadecyldimethylbenzyl ammonium chloride, hexamethonium chloride,benzalkonium chloride (a mixture of alkylbenzyldimethylammoniumchlorides in which the alkyl groups are long-chain compounds), andbenzethonium chloride. Other types of preservatives include aromaticalcohols such as phenol, butyl and benzyl alcohol, alkyl parabens suchas methyl or propyl paraben, catechol, resorcinol, cyclohexanol,3-pentanol, and m-cresol. The most preferred preservative herein isbenzyl alcohol.

“Treatment” refers to both therapeutic treatment and prophylactic orpreventative measures. Those in need of treatment include those alreadywith the disorder as well as those in which the disorder is to beprevented.

“Mammal” for purposes of treatment refers to any animal classified as amammal, including humans, domestic and farm animals, and zoo, sports, orpet animals, such as dogs, horses, rabbits, cattle, pigs, hamsters,gerbils, mice, ferrets, rats, cats, etc. Preferably, the mammal ishuman.

A “disorder” is any condition that would benefit from treatment with theprotein. This includes chronic and acute disorders or diseases includingthose pathological conditions which predispose the mammal to thedisorder in question. Non-limiting examples of disorders to be treatedherein include carcinomas and allergies.

A “therapeutically effective amount” is at least the minimumconcentration required to effect a measurable improvement or preventionof a particular disorder. Therapeutically effective amounts of knownproteins are well known in the art, while the effective amounts ofproteins hereinafter discovered may be determined by standard techniqueswhich are well within the skill of a skilled artisan, such as anordinary physician.

“Viscosity” as used herein may be “kinematic viscosity” or “absoluteviscosity.” “Kinematic viscosity” is a measure of the resistive flow ofa fluid under the influence of gravity. When two fluids of equal volumeare placed in identical capillary viscometers and allowed to flow bygravity, a viscous fluid takes longer than a less viscous fluid to flowthrough the capillary. If one fluid takes 200 seconds to complete itsflow and another fluid takes 400 seconds, the second fluid is twice asviscous as the first on a kinematic viscosity scale. “Absoluteviscosity”, sometimes called dynamic or simple viscosity, is the productof kinematic viscosity and fluid density:Absolute Viscosity=Kinematic Viscosity×DensityThe dimension of kinematic viscosity is L²/T where L is a length and Tis a time. Commonly, kinematic viscosity is expressed in centistokes(cSt). The SI unit of kinematic viscosity is mm²/s, which is 1 cSt.Absolute viscosity is expressed in units of centipoise (cP). The SI unitof absolute viscosity is the milliPascal-second (mPa-s), where 1 cP=1mPa-s.

An “antihistamine” as used herein is an agent that antagonizes thephysiological effect of histamine. The binding of histamine to itsreceptors, H₁ and H₂ results in the characteristic allergic symptoms andeffects or itching, redness, swelling etc. Many antihistamines act byblocking the binding of histamine to its receptors, H1, H2; howeverothers are believed to operate by inhibiting the release of histamine.Examples of antihistamines are chlorpheniramine, diphenhydramine,promethazine, cromolyn sodium, astemizole, azatadine maleate,bropheniramine maleate, carbinoxamine maleate, cetirizine hydrochloride,clemastine fumarate, cyproheptadine hydrochloride, dexbrompheniraminemaleate, dexchlorpheniramine maleate, dimenhydrinate, diphenhydraminehydrochloride, doxylamine succinate, fexofendadine hydrochloride,terphenadine hydrochloride, hydroxyzine hydrochloride, loratidine,meclizine hydrochloride, tripelannamine citrate, tripelennaminehydrochloride, triprolidine hydrochloride.

A “bronchodilator” as used herein, describes agents that antagonizes orreverses bronchoconstriction, a physiological event that occurstypically in early phase asthmatic reactions resulting in decreased lungcapacity and shortness of breadth. Example bronchodilators includeepinephrine, a broad acting alpha and beta-adrenergic, and thebeta-adrenergics albuterol, pirbuterol, metaproterenol, salmeterol, andisoetharine. Bronchodilation can also be achieved through administrationof xanthines, including aminophylline and theophylline.

A “glucocorticoid” as used herein describes steroidal based agentshaving anti-inflammatory acitivity. Glucocorticoid are commonly used toattenuate late phase asthmatic reaction. Example glucocorticoidsinclude, prednisone, beclomethasone dipropionate, triamcinoloneacetonide, flunisolide, betamethasone, budesonide, dexamethasone,fludrocortisone acetate, flunisolide, fluticasone propionate,hydrocortisone, methylprednisolone, prednisolone, prednisone andtriamcinolone.

A “non-steroidal anti-inflammatory drug” or “NSAID”, as used hereindescribes agents having anti-inflammatory activity that are notsteroidal based. Example NSAID's include acetaminophen, aspirin,bromfenac sodium, diclofenac sodium, diflunisal, etodolac, fenoprofencalcium, flurbiprofen, ibuprofen, indomethacin, ketoprofen,meclofenamate sodium, mefenamic acid, nabumetone, naproxen, naproxensodium, oxyphenbutazone, phenylbutzone, piroxicam, sulindac, tolmetinsodium.

II. Modes for Carrying out the Invention

A. Polypeptide and Antibody Preparation

The following description relates primarily to production of thepolyeptides or antibodies described herein by culturing cellstransformed or transfected with a vector containing nucleic acidencoding the same and purification of the resulting protein or antibody.It is, of course, contemplated that alternative methods, which are wellknown in the art, may be employed to prepare such polypeptides orantibodies. For instance, such sequences, or portions thereof, may beproduced by direct peptide synthesis using solid-phase techniques [see,e.g., Stewart et al., Solid-Phase Peptide Synthesis, W.H. Freeman Co.,San Francisco, Calif. (1969); Merrifield, J. Am. Chem. Soc.,85:2149-2154 (1963)]. In vitro protein synthesis may be performed usingmanual techniques or by automation. Automated synthesis may beaccomplished, for instance, using an Applied Biosystems PeptideSynthesizer (Foster City, Calif.) using manufacturer's instructions.Various portions of the proteins or antibodies described herein may bechemically synthesized separately and combined using chemical orenzymatic methods.

1. Isolation of DNA Encoding the Proteins Described Herein

DNA encoding the proteins described herein may be obtained from a cDNAlibrary prepared from tissue believed to possess the corresponding mRNAand to express it at a detectable level. Accordingly, such humanprotein-encoding DNA can be conveniently obtained from a cDNA libraryprepared from human tissue, such as described in the Examples. Theprotein-encoding gene may also be obtained from a genomic library or byknown synthetic procedures (e.g., automated nucleic acid synthesis).

Libraries can be screened with probes (such as oligonucleotides of atleast about 20-80 bases) designed to identify the gene of interest.Screening the cDNA or genomic library with the selected probe may beconducted using standard procedures, such as described in Sambrook etal., Molecular Cloning: A Laboratory Manual (New York: Cold SpringHarbor Laboratory Press, 1989). An alternative means to isolate the geneencoding the desired gene is to use PCR methodology [Sambrook et al.,supra; Dieffenbach et al., PCR Primer: A Laboratory Manual (Cold SpringHarbor Laboratory Press, 1995)].

The Examples below describe techniques for screening a cDNA library. Theoligonucleotide sequences selected as probes should be of sufficientlength and sufficiently unambiguous that false positives are minimized.The oligonucleotide is preferably labeled such that it can be detectedupon hybridization to DNA in the library being screened. Methods oflabeling are well known in the art, and include the use of radiolabelslike ³²P-labeled ATP, biotinylation or enzyme labeling. Hybridizationconditions, including moderate stringency and high stringency, areprovided in Sambrook et al., supra.

Sequences identified in such library screening methods can be comparedand aligned to other known sequences deposited and available in publicdatabases such as Genbank or other private sequence databases. Sequenceidentity (at either the amino acid or nucleotide level) within definedregions of the molecule or across the full-length sequence can bedetermined using methods known in the art and as described herein.

Nucleic acid having protein coding sequence may be obtained by screeningselected cDNA or genomic libraries using the deduced amino acid sequencedisclosed herein for the first time, and, if necessary, usingconventional primer extension procedures as described in Sambrook etal., supra, to detect precursors and processing intermediates of mRNAthat may not have been reverse-transcribed into cDNA.

2. Selection and Transformation of Host Cells

Host cells are transfected or transformed with expression or cloningvectors containing the proteins or antibodies described herein forproduction and cultured in conventional nutrient media modified asappropriate for inducing promoters, selecting transformants, oramplifying the genes encoding the desired sequences. The cultureconditions, such as media, temperature, pH and the like, can be selectedby the skilled artisan without undue experimentation. In general,principles, protocols, and practical techniques for maximizing theproductivity of cell cultures can be found in Mammalian CellBiotechnology: A Practical Approach, M. Butler, ed. (IRL Press, 1991)and Sambrook et al., supra.

Methods of eukaryotic cell transfection and prokaryotic celltransformation are known to the ordinarily skilled artisan, for example,CaCl₂, CaPO₄, liposome-mediated and electroporation. Depending on thehost cell used, transformation is performed using standard techniquesappropriate to such cells. The calcium treatment employing calciumchloride, as described in Sambrook et al., supra, or electroporation isgenerally used for prokaryotes. Infection with Agrobacterium tumefaciensis used for transformation of certain plant cells, as described by Shawet al., Gene, 23:315 (1983) and WO 89/05859 published 29 Jun. 1989. Formammalian cells without such cell walls, the calcium phosphateprecipitation method of Graham and van der Eb, Virology, 52:456-457(1978) can be employed. General aspects of mammalian cell host systemtransfections have been described in U.S. Pat. No. 4,399,216.Transformations into yeast are typically carried out according to themethod of Van Solingen et al., J. Bact., 130:946 (1977) and Hsiao etal., Proc. Natl. Acad. Sci. (USA), 76:3829 (1979). However, othermethods for introducing DNA into cells, such as by nuclearmicroinjection, electroporation, bacterial protoplast fusion with intactcells, or polycations, e.g., polybrene, polyornithine, may also be used.For various techniques for transforming mammalian cells, see Keown etal., Methods in Enzymology, 185:527-537 (1990) and Mansour et al.,Nature, 336:348-352 (1988).

Suitable host cells for cloning or expressing the DNA in the vectorsherein include prokaryote, yeast, or higher eukaryote cells. Suitableprokaryotes include but are not limited to eubacteria, such asGram-negative or Gram-positive organisms, for example,Enterobacteriaceae such as E. coli. Various E. coli strains are publiclyavailable, such as E. coli K12 strain MM294 (ATCC 31,446); E. coli X1776(ATCC 31,537); E. coli strain W3110 (ATCC 27,325) and K5 772 (ATCC53,635). Other suitable prokaryotic host cells includeEnterobacteriaceae such as Escherichia, e.g., E. coli, Enterobacter,Erwinia, Klebsiella, Proteus, Salmonella, e.g., Salmonella typhimurium,Serratia, e.g., Serratia marcescans, and Shigella, as well as Bacillisuch as B. subtilis and B. licheniformis (e.g., B. licheniformis 41Pdisclosed in DD 266,710 published 12 Apr. 1989), Pseudomonas such as P.aeruginosa, and Streptomyces. These examples are illustrative ratherthan limiting. Strain W3110 is one particularly preferred host or parenthost because it is a common host strain for recombinant DNA productfermentations. Preferably, the host cell secretes minimal amounts ofproteolytic enzymes. For example, strain W3110 may be modified to effecta genetic mutation in the genes encoding proteins endogenous to thehost, with examples of such hosts including E. coli W3110 strain 1A2,which has the complete genotype tonA; E. coli W3110 strain 9E4, whichhas the complete genotype tonA ptr3; E. coli W3110 strain 27C7 (ATCC55,244), which has the complete genotype tonA ptr3 phoA E15(argF-lac)169 degP ompT kan^(r) ; E. coli W3110 strain 37D6, which hasthe complete genotype tonA ptr3 phoA E15 (argF-lac)169 degP ompT rbs7ilvG kan^(r) ; E. coli W3110 strain 40B4, which is strain 37D6 with anon-kanamycin resistant degP deletion mutation; and an E. coli strainhaving mutant periplasmic protease disclosed in U.S. Pat. No. 4,946,783issued 7 Aug. 1990. Alternatively, in vitro methods of cloning, e.g.,PCR or other nucleic acid polymerase reactions, are suitable.

In addition to prokaryotes, eukaryotic microbes such as filamentousfungi or yeast are suitable cloning or expression hosts for vectorsencoding the proteins or antiobodies described herein. Saccharomycescerevisiae is a commonly used lower eukaryotic host microorganism.Others include. Schizosaccharomyces pombe (Beach and Nurse, Nature,290:140 [1981]; EP 139,383 published 2 May 1985); Kluyveromyces hosts(U.S. Pat. No. 4,943,529; Fleer et al., Biol/Technology, 9:968-975(1991)) such as, e.g., K. lactis (MW98-8C, CBS683, CBS4574; Louvencourtet al., J. Bacteriol., 154(2): 737-42 [1983]), K. fragilis (ATCC12,424), K. bulgaricus (ATCC 16,045), K. wickeramii (ATCC 24,178), K.waltii (ATCC 56,500), K. drosophilarum (ATCC 36,906; Van den Berg etal., Biol/Technology, 8:135 (1990)), K. thermotolerans, and K.marxianus; yarrowia (EP 402,226); Pichia pastoris (EP 183,070;Sreekrishna et al., J. Basic Microbiol, 28:265-278 [1988]); Candida;Trichoderma reesia (EP 244,234); Neurospora crassa (Case et al., Proc.Natl. Acad. Sci. USA, 76:5259-5263 [1979]); Schwanniomyces such asSchwanniomyces occidentalis (EP 394,538 published 31 Oct. 1990); andfilamentous fungi such as, e.g., Neurospora, Penicillium, Tolypocladium(WO 91/00357 published 10 Jan. 1991), and Aspergillus hosts such as A.nidulans (Ballance et al., Biochem. Biophys. Res. Commun., 112:284-289[1983]; Tilburn et al., Gene, 26:205-221 [1983]; Yelton et al., Proc.Natl. Acad. Sci. USA, 81: 1470-1474 [1984]) and A. niger (Kelly andHynes, EMBO J., 4:475-479 [1985]). Methylotropic yeasts are suitableherein and include, but are not limited to, yeast capable of growth onmethanol selected from the genera consisting of Hansenula, Candida,Kloeckera, Pichia, Saccharomyces, Torulopsis, and Rhodotorula. A list ofspecific species that are exemplary of this class of yeasts may be foundin C. Anthony, The Biochemistry of Methylotrophs, 269 (1982).

Suitable host cells for the expression of glycosylated form of thepolypeptides and antibodies described herein are derived frommulticellular organisms. Examples of invertebrate cells include insectcells such as Drosophila S2 and Spodoptera Sf9, as well as plant cells.Examples of useful mammalian host cell lines include Chinese hamsterovary (CHO) and COS cells. More specific examples include monkey kidneyCV1 line transformed by SV40 (COS-7, ATCC CRL 1651); human embryonickidney line (293 or 293 cells subcloned for growth in suspensionculture, Graham et al., Gen Virol., 36:59 (1977)); Chinese hamster ovarycells/-DHFR(CHO, Urlaub and Chasin, Proc. Natl. Acad. Sci. USA, 77:4216(1980)); mouse sertoli cells (TM4, Mather, Biol. Reprod., 23:243-251(1980)); human lung cells (W138, ATCC CCL 75); human liver cells (HepG2, HB 8065); and mouse mammary tumor (MMT 060562, ATCC CCL51). Theselection of the appropriate host cell is deemed to be within the skillin the art.

3. Selection and Use of a Replicable Vector

The nucleic acid (e.g., cDNA or genomic DNA) encoding the polypeptidesand antibodies described herein may be inserted into a replicable vectorfor cloning (amplification of the DNA) or for expression. Variousvectors are publicly available. The vector may, for example, be in theform of a plasmid, cosmid, viral particle, or phage. The appropriatenucleic acid sequence may be inserted into the vector by a variety ofprocedures. In general, DNA is inserted into an appropriate restrictionendonuclease site(s) using techniques known in the art. Vectorcomponents generally include, but are not limited to, one or more of asignal sequence, an origin of replication, one or more marker genes, anenhancer element, a promoter, and a transcription termination sequence.Construction of suitable vectors containing one or more of thesecomponents employs standard ligation techniques which are known to theskilled artisan.

Recombinant production of the polypeptides or antibodies may beaccomplished not only directly, but also as a fusion polypeptide with aheterologous polypeptide. The heterologous portion may be a signalsequence or other polypeptide having a specific cleavage site at theN-terminus of the mature protein or polypeptide. In general, the signalsequence may be a component of the vector, or it may be a part of theDNA encoding the polypeptide or antibody that is inserted into thevector. The signal sequence may be a prokaryotic signal sequenceselected, for example, from the group of the alkaline phosphatase,penicillinase, Ipp, or heat-stable enterotoxin II leaders. For yeastsecretion the signal sequence may be, e.g., the yeast invertase leader,alpha factor leader (including Saccharomyces and Kluyveromyces α-factorleaders, the latter described in U.S. Pat. No. 5,010,182), or acidphosphatase leader, the C. albicans glucoamylase leader (EP 362,179published 4 Apr. 1990), or the signal described in WO 90/13646 published15 Nov. 1990. In mammalian cell expression, mammalian signal sequencesmay be used to direct secretion of the protein, such as signal sequencesfrom secreted polypeptides of the same or related species, as well asviral secretory leaders.

Both expression and cloning vectors contain a nucleic acid sequence thatenables the vector to replicate in one or more selected host cells. Suchsequences are well known for a variety of bacteria, yeast, and viruses.The origin of replication from the plasmid pBR322 is suitable for mostGram-negative bacteria, the 2μ plasmid origin is suitable for yeast, andvarious viral origins (SV40, polyoma, adenovirus, VSV or BPV) are usefulfor cloning vectors in mammalian cells.

Expression and cloning vectors will typically contain a selection gene,also termed a selectable marker. Typical selection genes encode proteinsthat (a) confer resistance to antibiotics or other toxins, e.g.,ampicillin, neomycin, methotrexate, or tetracycline, (b) complementauxotrophic deficiencies, or (c) supply critical nutrients not availablefrom complex media, e.g., the gene encoding D-alanine racemase forBacilli.

An example of suitable selectable markers for mammalian cells are thosethat enable the identification of cells competent to take up the DNAsequence encoding the polypeptides or antibodies described herein, suchas DHFR or thymidine kinase. An appropriate host cell when wild-typeDHFR is employed is the CHO cell line deficient in DHFR activity,prepared and propagated as described by Urlaub et al., Proc. Natl. Acad.Sci. USA, 77:4216 (1980). A suitable selection gene for use in yeast isthe trp1 gene present in the yeast plasmid YRp7 [Stinchcomb et al.,Nature, 282:39 (1979); Kingsman et al., Gene, 7:141 (1979); Tschemper etal., Gene, 10:157 (1980)]. The trp1 gene provides a selection marker fora mutant strain of yeast lacking the ability to grow in tryptophan, forexample, ATCC No. 44076 or PEP4-1 [Jones, Genetics, 85:12 (1977)].

Expression and cloning vectors usually contain a promoter operablylinked to the such DNA sequences to direct mRNA synthesis. Promotersrecognized by a variety of potential host cells are well known.Promoters suitable for use with prokaryotic hosts include theβ-lactamase and lactose promoter systems [Chang et al., Nature, 275:615(1978); Goeddel et al., Nature, 281:544 (1979)], alkaline phosphatase, atryptophan (trp) promoter system [Goeddel, Nucleic Acids Res., 8:4057(1980); EP 36,776], and hybrid promoters such as the tac promoter[deBoer et al., Proc. Natl. Acad. Sci. USA, 80:21-25 (1983)]. Promotersfor use in bacterial systems also will contain a Shine-Dalgarno (S.D.)sequence operably linked to such DNA sequences.

Examples of suitable promoting sequences for use with yeast hostsinclude the promoters for 3-phosphoglycerate kinase [Hitzeman et al., J.Biol. Chem., 255:2073 (1980)] or other glycolytic enzymes [Hess et al.,J. Adv. Enzyme Reg., 7:149 (1968); Holland, Biochemistry, 17:4900(1978)], such as enolase, glyceraldehyde-3-phosphate dehydrogenase,hexokinase, pyruvate decarboxylase, phosphofructokinase,glucose-6-phosphate isomerase, 3-phosphoglycerate mutase, pyruvatekinase, triosephosphate isomerase, phosphoglucose isomerase, andglucokinase.

Other yeast promoters, which are inducible promoters having theadditional advantage of transcription controlled by growth conditions,are the promoter regions for alcohol dehydrogenase 2, isocytochrome C,acid phosphatase, degradative enzymes associated with nitrogenmetabolism, metallothionein, glyceraldehyde-3-phosphate dehydrogenase,and enzymes responsible for maltose and galactose utilization. Suitablevectors and promoters for use in yeast expression are further describedin EP 73,657.

Transcription from vectors in mammalian host cells may be controlled,for example, by promoters obtained from the genomes of viruses such aspolyoma virus, fowlpox virus (UK 2,211,504 published 5 Jul. 1989),adenovirus (such as Adenovirus 2), bovine papilloma virus, avian sarcomavirus, cytomegalovirus, a retrovirus, hepatitis-B virus and Simian Virus40 (SV40), from heterologous mammalian promoters, e.g., the actinpromoter or an immunoglobulin promoter, and from heat-shock promoters,provided such promoters are compatible with the host cell systems.

Transcription of nucleic acid encoding the polypeptides or antibodiesherein by higher eukaryotes may be increased by inserting an enhancersequence into the vector. Enhancers are cis-acting elements of DNA,usually about from 10 to 300 bp, that act on a promoter to increase itstranscription. Many enhancer sequences are now known from mammaliangenes (globin, elastase, albumin, α-fetoprotein, and insulin).Typically, however, one will use an enhancer from a eukaryotic cellvirus. Examples include the SV40 enhancer on the late side of thereplication origin (bp 100-270), the cytomegalovirus early promoterenhancer, the polyoma enhancer on the late side of the replicationorigin, and adenovirus enhancers. The enhancer may be spliced into thevector at a position 5′ or 3′ to the coding sequence, but is preferablylocated at a site 5′ from the promoter.

Expression vectors used in eukaryotic host cells (yeast, fungi, insect,plant, animal, human, or nucleated cells from other multicellularorganisms) will also contain sequences necessary for the termination oftranscription and for stabilizing the mRNA. Such sequences are commonlyavailable from the 5′ and, occasionally 3′, untranslated regions ofeukaryotic or viral DNAs or cDNAs. These regions contain nucleotidesegments transcribed as polyadenylated fragments in the untranslatedportion of the mRNA encoding the polypeptides or antibodies describedherein.

Still other methods, vectors, and host cells suitable for adaptation tothe synthesis of the polypeptide or antibodies described herein inrecombinant vertebrate cell culture are described in Gething et al.,Nature, 293:620-625 (1981); Mantei et al., Nature, 281:40-46 (1979); EP117,060; and EP 117,058.

4. Detecting Gene Amplification/Expression

Gene amplification and/or expression may be measured in a sampledirectly, for example, by conventional Southern blotting, Northernblotting to quantitate the transcription of mRNA [Thomas, Proc. Natl.Acad. Sci. USA, 77:5201-5205 (1980)], dot bthtting (DNA analysis), or insitu hybridization, using an appropriately labeled probe, based on thesequences provided herein. Alternatively, antibodies may be employedthat can recognize specific duplexes, including DNA duplexes, RNAduplexes, and DNA-RNA hybrid duplexes or DNA-protein duplexes. Theantibodies in turn may be labeled and the assay may be carried out wherethe duplex is bound to a surface, so that upon the formation of duplexon the surface, the presence of antibody bound to the duplex can bedetected.

Gene expression, alternatively, may be measured by immunologicalmethods, such as immunohistochemical staining of cells or tissuesections and assay of cell culture or body fluids, to quantitatedirectly the expression of gene product. Antibodies useful forimmunohistochemical staining and/or assay of sample fluids may be eithermonoclonal or polyclonal, and may be prepared in any mammal.Conveniently, the antibodies may be prepared against the polypeptidesdescribed herein or against a synthetic peptide based on the DNAsequences provided herein or against exogenous sequence fused to DNAencoding such polypeptides and antibodies and encoding a specificantibody epitope.

5. Purification of Polypeptide

Forms of may be recovered from culture medium or from host cell lysates.If membrane-bound, it can be released from the membrane using a suitabledetergent solution (e.g. Triton-X 100) or by enzymatic cleavage. Cellsemployed in expression of the polypeptides or antibodies describedherein can be disrupted by various physical or chemical means, such asfreeze-thaw cycling, sonication, mechanical disruption, or cell lysingagents.

It may be desired to purify the polypeptides or antibodies describedherein from recombinant cell proteins or other polypeptides. Thefollowing procedures are exemplary of suitable purification procedures:by fractionation on an ion-exchange column; ethanol precipitation;reverse phase HPLC; chromatography on silica or on a cation-exchangeresin such as DEAE; chromatofocusing; SDS-PAGE; ammonium sulfateprecipitation; gel filtration using, for example, Sephadex G-75; proteinA Sepharose columns to remove contaminants such as IgG; and metalchelating columns to bind epitope-tagged forms of the polypeptide orantibody. Various methods of protein purification may be employed andsuch methods are known in the art and described for example inDeutscher, Methods in Enzymology, 182 (1990); Scopes, ProteinPurification: Principles and Practice, Springer-Verlag, New York (1982).The purification step(s) selected will depend, for example, on thenature of the production process used and the particular polypeptide orantibody produced.

B. Antibody Preparation

In certain embodiments of the invention, the protein of choice is anantibody. Techniques for the production of antibodies, includingpolyclonal, monoclonal, humanized, bispecific and heteroconjugateantibodies follow.

1) Polyclonal Antibodies.

Polyclonal antibodies are generally raised in animals by multiplesubcutaneous (sc) or intraperitoneal (ip) injections of the relevantantigen and an adjuvant. It may be useful to conjugate the relevantantigen to a protein that is immunogenic in the species to be immunized,e.g., keyhole limpet hemocyanin (KLH), serum albumin, bovinethyroglobulin, or soybean trypsin inhibitor, using a bifunctional orderivatizing agent, e.g., maleimidobenzoyl sulfosuccinimide ester(conjugation through cysteine residues), N-hydroxysuccinimide (throughlysien residues), glutaraldehyde, succinic anhydride, SOCl₂, orR¹N═C═NR, where R and R¹ are independently lower alkyl groups. Examplesof adjuvants which may be employed include Freund's complete adjuvantand MPL-TDM adjuvant (monophosphoryl Lipid A, synthetic trehalosedicorynomycolate). The immunization protocol may be selected by oneskilled in the art without undue experimentation.

The animals are immunized against the antigen, immunogenic conjugates,or derivatives by combining, e.g., 100 μg or 5 μg or the protein orconjugate (for rabbits or mice, respectively) with 3 volumes of Freund'scomplete adjuvant and injecting the solution intradermally at multiplesites. One month later, the animals are boosted with ⅕ to 1/10 theoriginal amount of peptide or conjugate in Freund's complete adjuvant bysubcutaneous injection at multiple sites. Seven to fourteen days later,the animals are bled and the serum is assayed for antibody titer.Animals are boosted until the titer plateaus. Conjugates also can bemade in recombinant cell culture as protein fusions. Also, aggregatingagents such as alum are suitable used to enhance the immune response.

2) Monoclonal Antibodies.

Monoclonal antibodies are obtained from a population of substantiallyhomogeneous antibodies, i.e., the individual antibodies comprising thepopulation are identical except for possible naturally occurringmutations and/or post-translational modifications (e.g., isomerizations,amidations) that may be present in minor amounts. Thus, the modifier“monoclonal” indicates the character of the antibody as not being amixture of discrete antibodies.

For example, the monoclonal antibodies may be made using the hybridomamethod first described by Kohler et al., Nature, 256:495 (1975), or maybe made by recombinant DNA methods (U.S. Pat. No. 4,816,567).

In the hybridoma method, a mouse or other appropriate host animal, suchas a hamster, is immunized as hereinabove described to elicitlymphocytes that produce or are capable of producing antibodies thatwill specifically bind to the protein used for immunization.Alternatively, lymphocytes may be immunized in vitro. Lymphocytes thenare fused with myeloma cells using a suitable fusing agent, such aspolyethylene glycol, to form a hybridoma cell (Goding, MonoclonalAntibodies: Principles and Practice, pp. 59-103 (Academic Press, 1986).

The immunizing agent will typically include the antigenic protein or afusion variant thereof. Generally either peripheral blood lymphocytes(“PBLs”) are used if cells of human origin are desired, or spleen cellsor lymph node cells are used if non-human mammalian sources are desired.The lymphoctyes are then fused with an immortalized cell line using asuitable fusing agent, such as polyethylene glycol, to form a hybridomacell. Goding, Monoclonal Antibodies: Principles and Practice, AcademicPress (1986), pp. 59-103.

Immortalized cell lines are usually transformed mammalian cell,particularly myeloma cells of rodent, bovine and human origin. Usually,rat or mouse myeIoma cell lines are employed. The hybridoma cells thusprepared are seeded and grown in a suitable culture medium thatpreferably contains one or more substances that inhibit the growth orsurvival of the unfused, parental myeloma cells. For example, if theparental myeloma cells lack the enzyme hypoxanthine guaninephosphoribosyl transferase (HGPRT or HPRT), the culture medium for thehybridomas typically will include hypoxanthine, aminopterin, andthymidine (HAT medium), which substances prevent the growth ofHGPRT-deficient cells.

Preferred immortalized myeloma cells are those that fuse efficiently,support stable high-level production of antibody by the selectedantibody-producing cells, and are sensitive to a medium such as HATmedium. Among these, preferred are murine myeloma lines, such as thosederived from MOPC-21 and MPC-11 mouse tumors available from the SalkInstitute Cell Distribution Center, San Diego, Calif. USA, and SP-2cells (and derivatives thereof, e.g., X63-Ag8-653) available from theAmerican Type Culture Collection, Manassus, Va. USA. Human myeloma andmouse-human heteromyeloma cell lines also have been described for theproduction of human monoclonal antibodies (Kozbor, J. Immunol., 133:3001(1984); Brodeur et al., Monoclonal Antibody Production Techniques andApplications, pp. 51-63 (Marcel Dekker, Inc., New York, 1987)).

Culture medium in which hybridoma cells are growing is assayed forproduction of monoclonal antibodies directed against the antigen.Preferably, the binding specificity of monoclonal antibodies produced byhybridoma cells is determined by immunoprecipitation or by an in vitrobinding assay, such as radioimmunoassay (RIA) or enzyme-linkedimmunoabsorbent assay (ELISA).

The culture medium in which the hybridoma cells are cultured can beassayed for the presence of monoclonal antibodies directed again desiredantigen. Preferably, the binding affinity and specificity of themonoclonal antibody can be determined by immunoprecipitation or by an invitro binding assay, such as radioimmunoassay (RIA) or enzyme-linkedassay (ELISA). Such techniques and assays are known in the in art. Forexample, binding affinity may be determined by the Scatchard analysis ofMunson et al., Anal. Biochem., 107:220 (1980).

After hybridoma cells are identified that produce antibodies of thedesired specificity, affinity, and/or activity, the clones may besubcloned by limiting dilution procedures and grown by standard methods(Goding, supra). Suitable culture media for this purpose include, forexample, D-MEM or RPMI-1640 medium. In addition, the hybridoma cells maybe grown in vivo as ascites tumors in a mammal.

The monoclonal antibodies secreted by the subclones are suitablyseparated from the culture medium, ascites fluid, or serum byconventional immunoglobulin purification procedures such as, forexample, protein A-Sepharose, hydroxylapatite chromatography, gelelectrophoresis, dialysis, or affinity chromatography.

Monoclonal antibodies may also be made by recombinant DNA methods, suchas those described in U.S. Pat. No. 4,816,567, and as described above.DNA encoding the monoclonal antibodies is readily isolated and sequencedusing conventional procedures (e.g., by using oligonucleotide probesthat are capable of binding specifically to genes encoding the heavy andlight chains of murine antibodies). The hybridoma cells serve as apreferred source of such DNA. Once isolated, the DNA may be placed intoexpression vectors, which are then transfected into host cells such asE. coli cells, simian COS cells, Chinese hamster ovary (CHO) cells, ormyeloma cells that do not otherwise produce immunoglobulin protein, inorder to synthesize monoclonal antibodies in such recombinant hostcells. Review articles on recombinant expression in bacteria of DNAencoding the antibody include Skerra et al., Curr. Opinion in Immunol.,5:256-262 (1993) and Plückthun, Immunol. Revs. 130:151-188 (1992).

In a further embodiment, antibodies can be isolated from antibody phagelibraries generated using the techniques described in McCafferty et al.,Nature, 348:552-554 (1990). Clackson et al., Nature, 352:624-628 (1991)and Marks et al., J. Mol. Biol., 222:581-597 (1991) describe theisolation of murine and human antibodies, respectively, using phagelibraries. Subsequent publications describe the production of highaffinity (nM range) human antibodies by chain shuffling (Marks et al.,Bio/Technology, 10:779-783 (1992)), as well as combinatorial infectionand in vivo recombination as a strategy for constructing very largephage libraries (Waterhouse et al., Nucl. Acids Res., 21:2265-2266(1993)). Thus, these techniques are viable alternatives to traditionalmonoclonal antibody hybridoma techniques for isolation of monoclonalantibodies.

The DNA also may be modified, for example, by substituting the codingsequence for human heavy- and light-chain constant domains in place ofthe homologous murine sequences (U.S. Pat. No. 4,816,567; Morrison, etal., Proc. Natl Acad. Sci. USA, 81:6851 (1984)), or by covalentlyjoining to the immunoglobulin coding sequence all or part of the codingsequence for a non-immunoglobulin polypeptide. Typically suchnon-immunoglobulin polypeptides are substituted for the constant domainsof an antibody, or they are substituted for the variable domains of oneantigen-combining site of an antibody to create a chimeric bivalentantibody comprising one antigen-combining site having specificity for anantigen and another antigen-combining site having specificity for adifferent antigen.

The monoclonal antibodies described herein may by monovalent, thepreparation of which is well known in the art. For example, one methodinvolves recombinant expression of immunoglobulin light chain and amodified heavy chain. The heavy chain is truncated generally at anypoint in the Fc region so as to prevent heavy chain crosslinking.Alternatively, the relevant cysteine residues may be substituted withanother amino acid residue or are deleted so as to prevent crosslinking.In vitro methods are also suitable for preparing monovalent antibodies.Digestion of antibodies to produce fragments thereof, particularly Fabfragments, can be accomplished using routine techniques known in theart.

Chimeric or hybrid antibodies also may be prepared in vitro using knownmethods in synthetic protein chemistry, including those involvingcrosslinking agents. For example, immunotoxins may be constructed usinga disulfide-exchange reaction or by forming a thioether bond. Examplesof suitable reagents for this purpose include iminothiolate andmethyl-4-mercaptobutyrimidate.

3) Humanized Antibodies.

The antibodies of the invention may further comprise humanized or humanantibodies. Humanized forms of non-human (e.g., murine) antibodies arechimeric immunoglobulins, immunoglobulin chains or fragments thereof(such as Fv, Fab, Fab′, F(ab′)₂ or other antigen-binding subsequences ofantibodies) which contain minimal sequence derived from non-humanimmunoglobulin. Humanized antibodies include human immunoglobulins(recipient antibody) in which residues from a complementaritydetermining region (CDR) of the recipient are replaced by residues froma CDR of a non-human species (donor antibody) such as mouse, rat orrabbit having the desired specificity, affinity and capacity. In someinstances, Fv framework residues of the human immunoglobulin arereplaced by corresponding non-human residues. Humanized antibodies mayalso comprise residues which are found neither in the recipient antibodynor in the imported CDR or framework sequences. In general, thehumanized antibody will comprise substantially all of at least one, andtypically two, variable domain, in which all or substantially all of theCDR regions correspond to those of a non-human immunoglobulin and all orsubstantially all of the FR regions are those of a human immunoglobulinconsensus sequence. The humanized antibody optimally also will compriseat least a portion of an immunoglobulin constant region (Fc), typicallythat of a human immunoglobulin. Jones et al., Nature 321: 522-525(1986); Riechmann et al., Nature 332: 323-329 (1988) and Presta, Curr.Opin. Struct. Biol. 2: 593-596 (1992).

Methods for humanizing non-human antibodies are well known in the art.Generally, a humanized antibody has one or more amino acid residuesintroduced into it from a source which is non-human. These non-humanamino acid residues are often referred to as “import” residues, whichare typically taken from an “import” variable domain. Humanization canbe essentially performed following the method of Winter and co-workers,Jones et al., Nature 321:522-525 (1986); Riechmann et al., Nature332:323-327 (1988); Verhoeyen et al., Science 239:1534-1536 (1988), orthrough substituting rodent CDRs or CDR sequences for the correspondingsequences of a human antibody. Accordingly, such “humanized” antibodiesare chimeric antibodies (U.S. Pat. No. 4,816,567), wherein substantiallyless than an intact human variable domain has been substituted by thecorresponding sequence from a non-human species. In practice, humanizedantibodies are typically human antibodies in which some CDR residues andpossibly some FR residues are substituted by residues from analogoussites in rodent antibodies.

The choice of human variable domains, both light and heavy, to be usedin making the humanized antibodies is very important to reduceantigenicity. According to the so-called “best-fit” method, the sequenceof the variable domain of a rodent antibody is screened against theentire library of known human variable-domain sequences. The humansequence which is closest to that of the rodent is then accepted as thehuman framework (FR) for the humanized antibody. Sims et al., J.Immunol., 151:2296 (1993); Chothia et al., J. Mol. Biol., 196:901(1987). Another method uses a particular framework derived from theconsensus sequence of all human antibodies of a particular subgroup oflight or heavy chains. The same framework may be used for severaldifferent humanized antibodies. Carter et al., Proc. Natl. Acad. Sci.USA, 89:4285 (1992); Presta et al., J. Immmol., 151:2623 (1993).

It is further important that antibodies be humanized with retention ofhigh affinity for the antigen and other favorable biological properties.To achieve this goal, according to a preferred method, humanizedantibodies are prepared by a process of analysis of the parentalsequences and various conceptual humanized products usingthree-dimensional models of the parental and humanized sequences.Three-dimensional immunoglobulin models are commonly available and arefamiliar to those skilled in the art. Computer programs are availablewhich illustrate and display probable three-dimensional conformationalstructures of selected candidate immunoglobulin sequences. Inspection ofthese displays permits analysis of the likely role of the residues inthe functioning of the candidate immunoglobulin sequence, i.e., theanalysis of residues that influence the ability of the candidateimmunoglobulin to bind its antigen. In this way, FR residues can beselected and combined from the recipient and import sequences so thatthe desired antibody characteristic, such as increased affinity for thetarget antigen(s), is achieved. In general, the CDR residues aredirectly and most substantially involved in influencing antigen binding.

Various forms of the humanized antibody are contemplated. For example,the humanized antibody may be an antibody fragment, such as an Fab,which is optionally conjugated with one or more cytotoxic agent(s) inorder to generate an immunoconjugate. Alternatively, the humanizedantibody may be an intact antibody, such as an intact IgG1 antibody.

4) Human Antibodies

As an alternative to humanization, human antibodies can be generated.For example, it is now possible to produce transgenic animals (e.g.,mice) that are capable, upon immunization, of producing a fullrepertoire of human antibodies in the absence of endogenousimmunoglobulin production. For example, it has been described that thehomozygous deletion of the antibody heavy-chain joining region (J_(H))gene in chimeric and germ-line mutant mice results in completeinhibition of endogenous antibody production. Transfer of the humangerm-line immunoglobulin gene array in such germ-line mutant mice willresult in the production of human antibodies upon antigen challenge.See, e.g., Jakobovits et al., Proc. Natl. Acad. Sci. USA, 90:2551(1993); Jakobovits et al., Nature, 362:255-258 (1993); Bruggermann etal., Year in Immuno., 7:33 (1993); U.S. Pat. No. 5,591,669 and WO97/17852.

Alternatively, phage display technology can be used to produce humanantiobdies and antibody fragments in vitro, from immunoglublin variable(V) domain gene repertoires from unimmunized donors. McCafferty et al.,Nature 348:552-553 (1990); Hoogenboom and Winter, J. Mol. Biol. 227: 381(1991). According to this technique, antibody V domain genes are clonedin-frame into either a major or minor coat protein gene of a filamentousbacteriophage, such as M13 or fd, and displayed as functional antibodyfragments on the surface of the phage particle. Because the filamentousparticle contains a single-stranded DNA copy of the phage genome,selections based on the functional properties of the antibody alsoresult in seletion of the gene encoding the antibody exhibiting thoseproperties. Thus, the phage mimics some of the properties of the B-cell.Phage display can be performed in a variety of formats, reviewed in,e.g., Johnson, Kevin S, and Chiswell, David J., Curr. Opin Struct. Biol.3:564-571 (1993). Several sources of V-gene segments can be used forphage display. Clackson et al., Nature 352:624-628 (1991) isolated adiverse array of anti-oxazolone antibodies from a small randomcombinatorial library of V genes derived from the spleens of immunizedmice. A repertoire of V genes from unimmunized human donors can beconstructed and antibodies to a diverse array of antigens (includingself-antigens) can be isoalted essentially following the technqieusdescribed by Marks et al., J. Mol. Biol. 222:581-597 (1991), or Griffithet al., EMBO J. 12:725-734 (1993). See also, U.S. Pat. Nos. 5,565,332and 5,573,905.

The techniques of Cole et al., and Boerner et al., are also availablefor the preparation of human monoclonal antibodies (Cole et al.,Monoclonal Antibodies and Cancer Therapy, Alan R. Liss, p. 77 (1985) andBoerner et al., J. Immunol. 147(1): 86-95 (1991). Similarly, humanantibodies can be made by introducing human immunoglobulin loci intotransgenic animals, e.g., mice in which the endogenous immunoglobulingenes have been partially or completely inactivated. Upon challenge,human antibody production is observed, which closely resemble that seenin human in all respects, including gene rearrangement, assembly andantibody repertoire. This approach is described, for example, in U.S.Pat. Nos. 5,545,807; 5,545,806, 5,569,825, 5,625,126, 5,633,425,5,661,016 and in the following scientific publications: Marks et al.,Bio/Technology 10: 779-783 (1992); Lonberg et al., Nature 368: 856-859(1994); Morrison, Nature 368: 812-13 (1994), Fishwild et al., NatureBiotechnology 14: 845-51 (1996), Neuberger, Nature Biotechnology 14: 826(1996) and Lonberg and Huszar, Intern. Rev. Immunol. 13: 65-93 (1995).

Finally, human antibodies may also be generated in vitro by activated Bcells (see U.S. Pat. Nos. 5,567,610 and 5,229,275).

5) Antibody Fragments

In certain circumstances there are advantages to using antibodyfragments, rather than whole antibodies. Smaller fragment sizes allowsfor rapid clearance, and may lead to improved access to solid tumors.

Various techniques have been developed for the production of antibodyfragments. Traditionally, these fragments were derived via proteolyticdigestion of intact antibodies (see, e.g., Morimoto et al., J BiochemBiophys. Method. 24:107-117 (1992); and Brennan et al., Science 229:81(1985)). However, these fragments can now be produced directly byrecombinant host cells. Fab, Fv and scFv antibody fragments can all beexpressed in and secreted from E. coli, thus allowing the facileproduction of large amounts of these fragments. Antibody fragments canbe isolated from the antibody phage libraries discussed above.Alternatively, Fab′-SH fragments can be directly recovered from E. coliand chemically coupled to form F(ab′)₂ fragments (Carter et al.,Bio/Technology 10:163-167 (1992)). According to another approach,F(ab′)₂ fragments can be isolated directly from recombinant host cellculture. Fab and F(ab′)₂ with increase in vivo half-life is described inU.S. Pat. No. 5,869,046. In other embodiments, the antibody of choice isa single chain Fv fragment (scFv). See WO 93/16185; U.S. Pat. No.5,571,894 and U.S. Pat. No. 5,587,458. The antibody fragment may also bea “linear antibody”, e.g., as described in U.S. Pat. No. 5,641,870. Suchlinear antibody fragments may be monospecific or bispecific.

6) Antibody Dependent Enzyme-Mediated Prodrug Therapy (ADEPT)

The antibodies of the present invention may also be used in ADEPT byconjugating the antibody to a prodrug-activating enzyme which converts aprodrug (e.g. a peptidyl chemotherapeutic agent, see WO 81/01145) to anactive anti-cancer drug. See, for example, WO 88/07378 and U.S. Pat. No.4,975,278.

The enzyme component of the immunoconjugate useful for ADEPT includesany enzyme capable of acting on a prodrug in such as way so as toconvert it into its more active, cytotoxic form.

Enzymes that are useful in the method of this invention include, but arenot limited to, glycosidase, glucose oxidase, human lysozyme, humanglucuronidase, alkaline phosphatase useful for convertingphosphate-containing prodrugs into free drugs; arylsulfatase useful forconverting sulfate-containing prodrugs into free drugs; cytosinedeaminase useful for converting non-toxic 5-fluorocytosine into theanti-cancer drug 5-fluorouracil; proteases, such as serratia protease,thermolysin, subtilisin, carboxypeptidases (e.g., carboxypeptidase G2and carboxypeptidase A) and cathepsins (such as cathepsins B and L),that are useful for converting peptide-containing prodrugs into freedrugs; D-alanylcarboxypeptidases, useful for converting prodrugs thatcontain D-amino acid substituents; carbohydrate-cleaving enzymes such asβ-galactosidase and neuraminidase useful for converting glycosylatedprodrugs into free drugs; β-lactamase useful for converting drugsderivatized with β-lactams into free drugs; and penicillin amidases,such as penicillin Vamidase or penicillin G amidase, useful forconverting drugs derivatized at their amine nitrogens with phenoxyacetylor phenylacetyl groups, respectively, into free drugs. Alternatively,antibodies with enzymatic activity, also known in the art as “abzymes”can be used to convert the prodrugs of the invention into free activedrugs (see, e.g., Massey, Nature 328: 457-458 (1987)). Antibody-abzymeconjugates can be prepared as described herein for delivery of theabzyme to a tumor cell population.

The above enzymes can be covalently bound to the polypeptide orantibodies described herein by techniques well known in the art such asthe use of the heterobifunctional cross-linking agents discussed above.Alternatively, fusion proteins comprising at least the antigen bindingregion of the antibody of the invention linked to at least afunctionally active portion of an enzyme of the invention can beconstructed using recombinant DNA techniques well known in the art (see,e.g. Neuberger et al., Nature 312: 604-608 (1984)).

7) Bispecific and Polyspecific Antibodies

Bispecific antibodies (BsAbs) are antibodies that have bindingspecificities for at least two different epitopes, including those onthe same or another protein. Alternatively, one arm can be armed to bindto the target antigen, and another arm can be combined with an arm thatbinds to a triggering molecule on a leukocyte such as a T-cell receptormolecule (e.g., CD3), or Fc receptors for IgG (FcγR) such as FcγR1(CD64), FcγRII (CD32) and FcγRIII (CD16), so as to focus and localizecellular defense mechanisms to the target antigen-expressing cell. Suchantibodies can be derived from full length antibodies or antibodyfragments (e.g. F(ab′)₂ bispecific antibodies).

Bispecific antibodies may also be used to localize cytotoxic agents tocells which express the target antigen. Such antibodies possess one armthat binds the desired antigen and another arm that binds the cytotoxicagent (e.g., saporin, anti-interferon-a, vinca alkoloid, ricin A chain,methotrexate or radioactive isotope hapten). Examples of knownbispecific antibodies include anti-ErbB2/anti-FcgRIII (WO 96/16673),anti-ErbB2/anti-FcgRI (U.S. Pat. No. 5,837,234), anti-ErbB2/anti-CD3(U.S. Pat. No. 5,821,337).

Methods for making bispecific antibodies are known in the art.Traditional production of full length bispecific antibodies is based onthe coexpression of two immunoglobulin heavy chain-light chain pairs,where the two chains have different specificities. Millstein et al.,Nature, 305:537-539 (1983). Because of the random assortment ofimmunoglobulin heavy and light chains, these hybridomas (quadromas)produce a potential mixture of 10 different antibody molecules, of whichonly one has the correct bispecific structure. Purification of thecorrect molecule, which is usually done by affinity chromatographysteps, is rather cumbersome, and the product yields are low. Similarprocedures are disclosed in WO 93/08829 and in Traunecker et al., EMBOJ., 10:3655-3659 (1991).

According to a different approach, antibody variable domains with thedesired binding specificities (antibody-antigen combining sites) arefused to immunoglobulin constant domain sequences. The fusion preferablyis with an immunoglobulin heavy chain constant domain, comprising atleast part of the hinge, CH2, and CH3 regions. It is preferred to havethe first heavy-chain constant region (CH1) containing the sitenecessary for light chain binding, present in at least one of thefusions. DNAs encoding the immunoglobulin heavy chain fusions and, ifdesired, the immunoglobulin light chain, are inserted into separateexpression vectors, and are co-transfected into a suitable hostorganism. This provides for great flexibility in adjusting the mutualproportions of the three polypeptide fragments in embodiments whenunequal ratios of the three polypeptide chains used in the constructionprovide the optimum yields. It is, however, possible to insert thecoding sequences for two or all three polypeptide chains in oneexpression vector when the expression of at least two polypeptide chainsin equal ratios results in high yields or when the ratios are of noparticular significance.

In a preferred embodiment of this approach, the bispecific antibodiesare composed of a hybrid immunoglobulin heavy chain with a first bindingspecificity in one arm, and a hybrid immunoglobulin heavy chain-lightchain pair (providing a second binding specificity) in the other arm. Itwas found that this asymmetric structure facilitates the separation ofthe desired bispecific compound from unwanted immunoglobulin chaincombinations, as the presence of an immunoglobulin light chain in onlyone half of the bispecific molecules provides for an easy way ofseparation. This approach is disclosed in WO 94/04690. For furtherdetails of generating bispecific antibodies, see, for example, Suresh etal., Methods in Enzymology 121: 210 (1986).

According to another approach described in WO 96/27011 or U.S. Pat. No.5,731,168, the interface between a pair of antibody molecules can beengineered to maximize the percentage of heterodimers which arerecovered from recombinant cell culture. The preferred interfacecomprises at least a part of the CH3 region of an antibody constantdomain. In this method, one or more small amino acid side chains fromthe interface of the first antibody molecule are replaced with largerside chains (e.g., tyrosine or tryptophan). Compensatory “cavities” ofidentical or similar size to the large side chains(s) are created on theinterface of the second antibody molecule by replacing large amino acidside chains with smaller ones (e.g., alanine or threonine). Thisprovides a mechanism for increasing the yield of the heterodimer overother unwanted end-products such as homodimers.

Techniques for generating bispecific antibodies from antibody fragmentshave been described in the literature. For example, bispecificantibodies can be prepared using chemical linkage. Brennan et al.,Science 229: 81 (1985) describe a procedure wherein intact antibodiesare proteolytically cleaved to generate F(ab′)₂ fragments. Thesefragments are reduced in the presence of the dithiol complexing agentsodium arsenite to stabilize vicinal dithiols and prevent intermoleculardisulfide formation. The Fab′ fragments generated are then converted tothionitrobenzoate (TNB) derivatives. One of the Fab′-TNB derivatives isthen reconverted to the Fab′-TNB derivative to form the bispecificantibody. The bispecific antibodies produced can be used as agents forthe selective immobilization of enzymes.

Fab′ fragments may be directly recovered from E. coli and chemicallycoupled to form bispecific antibodies. Shalaby et al., J. Exp. Med. 175:217-225 (1992) describes the production of fully humanized bispecificantibody F(ab′)₂ molecules. Each Fab′ fragment was separately secretedfrom E. coli and subjected to directed chemical coupling in vitro toform the bispecific antibody. The bispecific antibody thus formed wasable to bind to cells overexpressing the ErbB2 receptor and normal humanT cells, as well as trigger the lytic activity of human cytotoxiclymphocytes against human breast tumor targets.

Various techniques for making and isolating bivalent antibody fragmentsdirectly from recombinant cell culture have also been described. Forexample, bivalent heterodimers have been produced using leucine zippers.Kostelny et al., J. Immunol., 148(5):1547-1553 (1992). The leucinezipper peptides from the Fos and Jun proteins were linked to the Fab′portions of two different antibodies by gene fusion. The antibodyhomodimers were reduced at the hinge region to form monomers and thenre-oxidized to form the antibody heterodimers. The “diabody” technologydescribed by Hollinger et al., Proc. Natl. Acad. Sci. USA, 90: 6444-6448(1993) has provided an alternative mechanism for makingbispecific/bivalent antibody fragments. The fragments comprise aheavy-chain variable domain (V_(H)) connected to a light-chain variabledomain (V_(L)) by a linker which is too short to allow pairing betweenthe two domains on the same chain. Accordingly, the V_(H) and V_(L)domains of one fragment are forced to pair with the complementary V_(L)and V_(H) domains of another fragment, thereby forming twoantigen-binding sites. Another strategy for making bispecific/bivalentantibody fragments by the use of single-chain Fv (sFv) dimers has alsobeen reported. See Gruber et al., J. Immunol., 152:5368 (1994).

Antibodies with more than two valencies are contemplated. For example,trispecific antibodies can be prepared. Tutt et al., J. Immunol. 147: 60(1991).

Exemplary bispecific antibodies may bind to two different epitopes on agiven molecule. Alternatively, an anti-protein arm may be combined withan arm which binds to a triggering molecule on a leukocyte such as aT-cell receptor molecule (e.g., CD2, CD3, CD28 or B7), or Fc receptorsfor IgG (FcγR), such as FcγRI (CD64), FcγRII (CD32) and FcγRIII (CD16)so as to focus cellular defense mechanisms to the cell expressing theparticular protein. Bispecific antibocis may also be used to localizecytotoxic agents to cells which express a particular protein. Suchantibodies possess a protein-binding arm and an arm which binds acytotoxic agent or a radionuclide chelator, such as EOTUBE, DPTA, DOTAor TETA. Another bispecific antibody of interest binds the protein ofinterest and further binds tissue factor (IF).

6) Heteroconjugate Antibodies

Heteroconjugate antibodies are also within the scope of the presentinvention. Heteroconjugate antibodies are composed of two covalentlyjoined antibodies. For example, one of the antibodies in theheteroconjugate can be coupled to avidin, the other to biotin. Suchantibodies have, for example, been proposed to target immune systemcells to unwanted cells, U.S. Pat. No. 4,676,980, and for treatment ofHIV infection. WO 91/00360, WO 92/200373 and EP 0308936. It iscontemplated that the antibodies may be prepared in vitro using knownmethods in synthetic protein chemistry, including those involvingcrosslinking agents. For example, immunotoxins may be constructed usinga disulfide exchange reaction or by forming a thioether bond. Examplesof suitable reagents for this purpose include iminothiolate andmethyl-4-mercaptobutyrimidate and those disclosed, for example, in U.S.Pat. No. 4,676,980. Heteroconjugate antibodies may be made using anyconvenient cross-linking methods. Suitable cross-linking agents are wellknown in the art, and are disclosed in U.S. Pat. No. 4,676,980, alongwith a number of cross-linking techniques.

7) Effector Function Engineering

It may be desirable to modify the antibody of the invention with respectto effector function, so as to enhance the effectiveness of the antibodyin treating cancer. For example, cysteine residue(s) may be introducedinto the Fc region, thereby allowing interchain disulfide bond formationin this region. The homodimeric antibody thus generated may haveimproved internalization capability and/or increased complement-mediatedcell killing and antibody-dependent cellular cytotoxicity (ADCC). SeeCaron et al., J. Exp. Med. 176:1191-1195 (1992) and Shopes, J. Immunol.148: 2918-2922 (1992). Homodimeric antibodies with enhanced anti-tumoractivity may also be prepared using heterobifunctional cross-linkers asdescribed in Wolff et al., Cancer Research 53: 2560-2565 (1993).Alternatively, an antibody can be engineered that has dual Fc regionsand may thereby have enhanced complement lysis and ADCC capabilities.See Stevenson et al., Anti-Cancer Drug Design 3: 219-230 (1989).

8) Immunoconjugates

The invention also pertains to immunoconjugates comprising an antibodyconjugated to a cytotoxic agent such as a chemotherapeutic agent, toxin(e.g., an enzymatically active toxin of bacterial, fungal, plant, oranimal origin, or fragments thereof), or a radioactive isotope (i.e., aradioconjugate).

Chemotherapeutic agents useful in the generation of suchimmunoconjugates include BCNU, streptozoicin, vincristine, vinblastine,adriamycin and 5-fluorouracil.

Enzymatically active toxins and fragments thereof that can be usedinclude diphtheria A chain, nonbinding active fragments of diphtheriatoxin, exotoxin A chain (from Pseudomonas aeruginosa), ricin A chain,abrin A chain, modeccin A chain, alpha-sarcin, Aleurites fordiiproteins, dianthin proteins, Phytolaca americana proteins (PAPI, PAM,and PAP-S), momordica charantia inhibitor, curcin, crotin, sapaonariaofficinalis inhibitor, gelonin, mitogellin, restrictocin, phenomycin,enomycin, and the tricothecenes.

Conjugates of the antibody and cytotoxic agent are made using a varietyof bifunctional protein-coupling agents such asN-succinimidyl-3-(2-pyridyldithiol) propionate (SPDP), iminothiolane(IT), bifunctional derivatives of imidoesters (such as dimethyladipimidate HCL), active esters (such as disuccinimidyl suberate),aldehydes (such as glutareldehyde), bis-azido compounds (such asbis(p-azidobenzoyl) hexanediamine), bis-diazonium derivatives (such asbis-(p-diazoniumbenzoyl)-ethylenediamine), diisocyanates (such astolyene 2,6-diisocyanate), and bis-active fluorine compounds (such as1,5-difluoro-2,4-dinitrobenzene). For example, a ricin immunotoxin canbe prepared as described in Vitetta et al., Science, 238: 1098 (1987).Carbon-14-labeled 1-isothiocyanatobenzyl-3-methyldiethylenetriaminepentaacetic acid (MX-DTPA) is an exemplary chelating agent forconjugation of radionucleotide to the antibody. See WO94/11026. Thelinker may be a “cleavable linker” facilitating release of the cytotoxicdrug in the cell. For example, an acid-labile linker, peptidase-snsitivelinker, dimethyl linker or disulfide-containing linker (Chari et al.,Cancer Res. 52:127-131 (1992)) may be used.

Additionally, the small molecule toxins such as calicheamicin,maytansine (U.S. Pat. No. 5,208,020), trichothene and CC1065 are alsocontemplated an conjugatable toxins for use with the inventiveformulation. In one embodiment the full length antibody or antigenbinding fragments thereof can be conjugated to one or more maytansinoidmolecules (e.g., about 1 to about 10 maytansinoid molecules per antibodymolecule). Maytansinoids are mitototic inhibitors which act byinhibiting tubulin polymerization. Maytansinoids, isolated from naturalsources or prepared synthetically, including maytansine, maytansinal andderivatives and analogues thereof have been described, see e.g., U.S.Pat. No. 5,208,020 and references cited therein (see col. 2, line 53 tocol. 3, line 10) and U.S. Pat. Nos. 3,896,111 and 4,151,042. Method ofpreparing antibody-maytansinoid conjugates are also described in U.S.Pat. No. 5,208,020. In a preferred embodiment, a maytansinoid is linkedto the antibody via a disulfide or other sulfur-containing linker group.Maytansine may, for example, be converted to May-SS-Me, which may bereduced to May-SH3 and reacted with modified antibody to generate amaytansinoid-antibody immunoconjugate. Chari et al., Cancer Res. 52:127-131 (1992). The antibody can be modified by known methods and theantibody containing free or protected thiol groups is then reacted witha disulfide containing maytansinoid to produce the conjugate. Thecytotoxicity of the antibody-maytansinoid conjugate can be measured invitro or in vivo by known methods and the IC₅₀ determined.

Calicheamicin is another immunoconjugate of interest. The calicheamicinfamily of antibiotics are capable of producing double-stranded DNAbreaks at sub-picomolar concentrations. Structural analogues ofcalicheamicin which may be used include, but are not limited to, γ₁ ¹,α₂ ¹, α₃ ¹, N aceytl γ₁ ¹, PSAG and θ¹ ₁ (Hinman et al., Cancer Res.53:3336-3342 (1993) and Lode et al., Cancer Res. 58:2925-2928 (1998)).Other anti-tumor drugs that the antibody can be conjugated to includeQFA which is an antifolate. Both calicheamicin and QFA haveintracellular sites of actions and do not readily corss the plasmamembrane. Therefore, cellular uptake of these agents through antibodymediated internalization greatly enhances their cytotoxic effects.

Immunoconjugates formed between an antibody and a compound withnucleolytic activity (e.g., a ribonuclease or DNA endonuclease such asdeoxyribonuclease, DNase) are also contemplated.

The antibody may also be conjugated to a highly radioactive atom. Avariety of radionuclides are available for the production ofradioconjugated antibodies. Examples include At²¹¹, Bi²¹², I¹³¹, In¹³¹,Y⁹⁰, Re¹⁸⁶, Re¹⁸⁸, Sm¹⁵³, P³² and Pb²¹² and radioactive isotopes of Lu.When the conjugate is used for diagnosis, it may comprise a radioactiveatom for scintigraphic studies, for example Tc⁹⁹ or I¹²³, or a spinlabel for nuclear magnetic resonance (nmr) imaging (also known asmagnetic resonance imaging, mri), wuch as iodine-123, iodine-131,indium-111, fluorine-19, carbon-13, nitrogen-15, oxygen-17, gadolinium,manganese or iron.

The radio- or other labels may be incorporated in the conjugate in knownways. For example, the peptide may be biosynthesized or may besynthesized by chemical amino acid synthesis using suitable amino acidprecursors involving, for example, fluorine-19 in place or hydrogen.Labels such Tc⁹⁹ or I¹²³, Re¹⁸⁶, Re¹⁸⁸ and In¹¹¹ can be attached via acysteine residue in the peptide. Yttrium-90 can be attached via a lysineresidue. The IODOGEN® method can be used to incorporate iodine-123,Fraker et al., Biohem. Biophys. Res. Commun. 80:49-57 (1978). Othermethods of conjugating radionuclides are described in “MonoclonalAntibodies in Immunoscintigraphy,” (Chatal, CRC Press 1989).

Alternatively, a fusion protein comprising the antibody and thecytotoxic agent may be made by recombinant techniques or peptidesynthesis. The length of DNA may comprise respective regions encodingthe two portions of the conjugate either adjacent to one another orseparated by a region encoding a linker peptide which does not destroythe desired properties of the conjugate.

In another embodiment, the antibody may be conjugated to a “receptor”(such streptavidin) for utilization in tumor pretargeting wherein theantibody-receptor conjugate is administered to the patient, followed byremoval of unbound conjugate from the circulation using a clearing agentand then administration of a “ligand” (e.g., avidin) that is conjugatedto a cytotoxic agent (e.g., a radionucleotide).

9) Immunoliposomes

The antibodies disclosed herein may also be formulated asimmunoliposomes. A “liposome” is a small vesicle composed of varioustypes of lipids, phospholipids and/or surfactant which is useful fordelivery of a drug to a mammal. The components of the liposome arecommonly arranged in a bilayer formation, similar to the lipidarrangement of biological membranes.

Liposomes containing the antibody are prepared by methods known in theart, such as described in Epstein et al., Proc. Natl. Acad. Sci. USA,82: 3688 (1985); Hwang et al., Proc. Natl. Acad. Sci. USA, 77: 4030(1980); and U.S. Pat. Nos. 4,485,045 and 4,544,545. Liposomes withenhanced circulation time are disclosed in U.S. Pat. No. 5,013,556.

Particularly useful liposomes can be generated by the reverse-phaseevaporation method with a lipid composition comprisingphosphatidylcholine, cholesterol, and PEG-derivatizedphosphatidylethanolamine (PEG-PE). Liposomes are extruded throughfilters of defined pore size to yield liposomes with the desireddiameter. Fab′ fragments of the antibody of the present invention can beconjugated to the liposomes as described in Martin et al., J. Biol.Chem., 257: 286-288 (1982) via a disulfide-interchange reaction. Achemotherapeutic agent (such as Doxorubicin) is optionally containedwithin the liposome. See Gabizon et al., J. National Cancer Inst.81(19):1484 (1989).

10) Other Antibody Modifications

Other modifications of the antibody are contemplated herein. Forexample, the antibody may be linked to one of a variety ofnonproteinaceous polymers, e.g., polyethylene glycol, polypropyleneglycol, polyoxyalkylenes, or copolymers of polyethylene glycol andpolypropylene glycol. The antibody also may be entrapped inmicrocapsules prepared, for example, by coacervation techniques or byinterfacial polymerization (for example, hydroxymethylcellulose orgelatin-microcapsules and poly-(methylmethacrylate) microcapsules,respectively), in colloidal drug delivery systems (for example,liposomes, albumin microspheres, microemulsions, nano-particles andnanocapsules), or in macroemulsions. Such techniques and other suitableformulations are disclosed in Remington: The Science and Practice ofPharmacy, 20th Ed., Alfonso Gennaro, Ed., Philadelphia College ofPharmacy and Science (2000).

C. Lyophilized Formulations

The formulations described herein may also be prepared as reconstitutedlyophilized formulations. The proteins or antibodies described hereinare lyophilized and then reconstituted to produce the reduced-viscositystable liquid formulations of the invention. In this particularembodiment, after preparation of the protein of interest as describedabove, a “pre-lyophilized formulation” is produced. The amount ofprotein present in the pre-lyophilized formulation is determined takinginto account the desired dose volumes, mode(s) of administration etc.For example, the starting concentration of an intact antibody can befrom about 2 mg/ml to about 50 mg/ml, preferably from about 5 mg/ml toabout 40 mg/ml and most preferably from about 20-30 mg/ml.

1) Preparation of Lyophilized Formulations

The protein to be formulated is generally present in solution. Forexample, in the elevated ionic strength reduced viscosity formulationsof the invention, the protein may be present in a pH-buffered solutionat a pH from about 4-8, and preferably from about 5-7. The bufferconcentration can be from about 1 mM to about 20 mM, alternatively fromabout 3 mM to about 15 mM, depending, for example, on the buffer and thedesired tonicity of the formulation (e.g. of the reconstitutedformulation). Exemplary buffers and/or salts are those which arepharmaceutically acceptable and may be created from suitable acids,bases and salts thereof, such as those which are defined under“pharmaceutically acceptable” acids, bases or buffers.

In one embodiment, a lyoprotectant is added to the pre-lyophilizedformulation. The amount of lyoprotectant in the pre-lyophilizedformulation is generally such that, upon reconstitution, the resultingformulation will be isotonic. However, hypertonic reconstitutedformulations may also be suitable. In addition, the amount oflyoprotectant must not be too low such that an unacceptable amount ofdegradation/aggregation of the protein occurs upon lyophilization.However, exemplary lyoprotectant concentrations in the pre-lyophilizedformulation are from about 10 mM to about 400 mM, alternatively fromabout 30 mM to about 300 mM, alternatively from about 50 mM to about 100mM. Examplery lyoprotectants include sugars and sugar alcohols such assucrose, mannose, trehalose, glucose, sorbitol, mannitol. However, underparticular circumstances, certain lyoprotectants may also contribute toan increase in viscosity of the formulation. As such, care should betaken so as to select particular lyoprotectants which minimize orneutralize this effect. Additional lyoprotectants are described aboveunder the definition of “lyoprotectants”, also referred herein as“pharmaceutically-acceptable sugars”.

The ratio of protein to lyoprotectant can vary for each particularprotein or antibody and lyoprotectant combination. In the case of anantibody as the protein of choice and a sugar (e.g., sucrose ortrehalose) as the lyoprotectant for generating an isotonic reconstitutedformulation with a high protein concentration, the molar ratio oflyoprotectant to antibody may be from about 100 to about 1500 moleslyoprotectant to 1 mole antibody, and preferably from about 200 to about1000 moles of lyoprotectant to 1 mole antibody, for example from about200 to about 600 moles of lyoprotectant to 1 mole antibody.

In a preferred embodiment, it may be desirable to add a surfactant tothe pre-lyophilized formulation. Alternatively, or in addition, thesurfactant may be added to the lyophilized formulation and/or thereconstituted formulation. Exemplary surfactants include nonionicsurfactants such as polysorbates (e.g. polysorbates 20 or 80);polyoxamers (e.g. poloxamer 188); Triton; sodium octyl glycoside;lauryl-, myristyl-, linoleyl-, or stearyl-sulfobetaine; lauryl-,myristyl-, linoleyl- or stearyl-sarcosine; linoleyl-, myristyl-, orcetyl-betaine; lauroamidopropyl-, cocamidopropyl-, linoleamidopropyl-,myristamidopropyl-, palmidopropyl-, or isostearamidopropyl-betaine (e.g.lauroamidopropyl); myristamidopropyl-, palmidopropyl-, orisostearamidopropyl-dimethylamine; sodium methyl cocoyl-, or disodiummethyl oleyl-taurate; and the MONAQUA™ series (Mona Industries, Inc.,Paterson, N.J.), polyethyl glycol, polypropyl glycol, and copolymers ofethylene and propylene glycol (e.g. Pluronics, PF68 etc). The amount ofsurfactant added is such that it reduces particulate formation of thereconstituted protein and minimizes the formation of particulates afterreconstitution. For example, the surfactant may be present in thepre-lyophilized formulation in an amount from about 0.001-0.5%,alternatively from about 0.005-0.05%.

A mixture of the lyoprotectant (such as sucrose or trehalose) and abulking agent (e.g. mannitol or glycine) may be used in the preparationof the pre-lyophilization formulation. The bulking agent may allow forthe production of a uniform lyophilized cake without excessive pocketstherein etc. Other pharmaceutically acceptable carriers, excipients orstabilizers such as those described in Remington's PharmaceuticalSciences 16th edition, Osol, A. Ed. (1980) may be included in thepre-lyophilized formulation (and/or the lyophilized formulation and/orthe reconstituted formulation) provided that they do not adverselyaffect the desired characteristics of the formulation. Acceptablecarriers, excipients or stabilizers are nontoxic to recipients at thedosages and concentrations employed and include; additional bufferingagents; preservatives; co-solvents; antioxidants including ascorbic acidand methionine; chelating agents such as EDTA; metal complexes (e.g.Zn-protein complexes); biodegradable polymers such as polyesters; and/orsalt-forming counterions such as sodium.

The formulation herein may also contain more than one protein asnecessary for the particular indication being treated, preferably thosewith complementary activities that do not adversely affect the otherprotein. For example, it may be desirable to provide two or moreantibodies which bind to the desired target (e.g., receptor or antigen)in a single formulation. Such proteins are suitably present incombination in amounts that are effective for the purpose intended.

The formulations to be used for in vivo administration must be sterile.This is readily accomplished by filtration through sterile filtrationmembranes, prior to, or following, lyophilization and reconstitution.Alternatively, sterility of the entire mixture may be accomplished byautoclaving the ingredients, except for protein, at about 120° C. forabout 30 minutes, for example.

After the protein, optional lyoprotectant and other optional componentsare mixed together, the formulation is lyophilized. Many differentfreeze-dryers are available for this purpose such as Hull50™ (Hull, USA)or GT20™ (Leybold-Heraeus, Germany) freeze-dryers. Freeze-drying isaccomplished by freezing the formulation and subsequently subliming icefrom the frozen content at a temperature suitable for primary drying.Under this condition, the product temperature is below the eutecticpoint or the collapse temperature of the formulation. Typically, theshelf temperature for the primary drying will range from about −30 to25° C. (provided the product remains frozen during primary drying) at asuitable pressure, ranging typically from about 50 to 250 mTorr. Theformulation, size and type of the container holding the sample (e.g.,glass vial) and the volume of liquid will mainly dictate the timerequired for drying, which can range from a few hours to several days(e.g. 40-60 hrs). Optionally, a secondary drying stage may also beperformed depending upon the desired residual moisture level in theproduct. The temperature at which the secondary drying is carried outranges from about 0-40° C., depending primarily on the type and size ofcontainer and the type of protein employed. For example, the shelftemperature throughout the entire water removal phase of lyophilizationmay be from about 15-30° C. (e.g., about 20° C.). The time and pressurerequired for secondary drying will be that which produces a suitablelyophilized cake, dependent, e.g., on the temperature and otherparameters. The secondary drying time is dictated by the desiredresidual moisture level in the product and typically takes at leastabout 5 hours (e.g. 10-15 hours). The pressure may be the same as thatemployed during the primary drying step. Freeze-drying conditions can bevaried depending on the formulation and vial size.

2. Reconstitution of a Lyophilized Formulation

Prior to administration to the patient, the lyophilized formulation isreconstituted with a pharmaceutically acceptable diluent such that theprotein concentration in the reconstituted formulation is at least about50 mg/ml, for example from about 50 mg/ml to about 400 mg/ml,alternatively from about 80 mg/ml to about 300 mg/ml, alternatively fromabout 90 mg/ml to about 150 mg/ml. Such high protein concentrations inthe reconstituted formulation are considered to be particularly usefulwhere subcutaneous delivery of the reconstituted formulation isintended. However, for other routes of administration, such asintravenous administration, lower concentrations of the protein in thereconstituted formulation may be desired (for example from about 5-50mg/ml, or from about 10-40 mg/ml protein in the reconstitutedformulation). In certain embodiments, the protein concentration in thereconstituted formulation is significantly higher than that in thepre-lyophilized formulation. For example, the protein concentration inthe reconstituted formulation may be about 2-40 times, alternatively3-10 times, alternatively 3-6 times (e.g. at least three fold or atleast four fold) that of the pre-lyophilized formulation.

Reconstitution generally takes place at a temperature of about 25° C. toensure complete hydration, although other temperatures may be employedas desired. The time required for reconstitution will depend, e.g., onthe type of diluent, amount of excipient(s) and protein. Exemplarydiluents include sterile water, bacteriostatic water for injection(BWFI), a pH buffered solution (e.g. phosphate-buffered saline), sterilesaline solution, Ringer's solution or dextrose solution. The diluentoptionally contains a preservative. Exemplary preservatives have beendescribed above, with aromatic alcohols such as benzyl or phenol alcoholbeing the preferred preservatives. The amount of preservative employedis determined by assessing different preservative concentrations forcompatibility with the protein and preservative efficacy testing. Forexample, if the preservative is an aromatic alcohol (such as benzylalcohol), it can be present in an amount from about 0.1-2.0% andpreferably from about 0.5-1.5%, but most preferably about 1.0-1.2%.

Preferably, the reconstituted formulation has less than 6000 particlesper vial which are ≧10 μm in size.

D. Liquid Formulations

Therapeutic formulations are prepared for storage by mixing the activeingredient having the desired degree of purity with optionalpharmaceutically acceptable carriers, excipients or stabilizers(Remington's Pharmaceutical Sciences 18th edition, Mack Publishing Co.,Easton, Pa. 18042 [1990]). Acceptable carriers, excipients, orstabilizers are nontoxic to recipients at the dosages and concentrationsemployed, and include buffers, antioxidants including ascorbic acid,methionine, Vitamin E, sodium metabisulfite; preservatives,isotonicifiers, stabilizers, metal complexes (e.g. Zn-proteincomplexes); chelating agents such as EDTA and/or non-ionic surfactants.

When the therapeutic agent is an antibody fragment, the smallestinhibitory fragment which specifically binds to the binding domain ofthe target protein is preferred. For example, based upon the variableregion sequences of an antibody, antibody fragments or even peptidemolecules can be designed which retain the ability to bind the targetprotein sequence. Such peptides can be synthesized chemically and/orproduced by recombinant DNA technology (see, e.g., Marasco et al., Proc.Natl. Acad. Sci. USA 90: 7889-7893 [1993]).

Buffers are used to control the pH in a range which optimizes thetherapeutic effectiveness, especially if stability is pH dependent.Buffers are preferably present at concentrations ranging from about 50mM to about 250 mM. Suitable buffering agents for use with the presentinvention include both organic and inorganic acids and salts thereof.For example, citrate, phosphate, succinate, tartrate, fumarate,gluconate, oxalate, lactate, acetate. Additionally, buffers may becomprised of histidine and trimethylamine salts such as Tris.

Preservatives are added to retard microbial growth, and are typicallypresent in a range from 0.2%-1.0% (w/v). Suitable preservatives for usewith the present invention include (such as octadecyldimethylbenzylammonium chloride; hexamethonium chloride; benzalkonium halides (e.g.,chloride, bromide, iodide), benzethonium chloride; thimerosal, phenol,butyl or benzyl alcohol; alkyl parabens such as methyl or propylparaben; catechol; resorcinol; cyclohexanol, 3-pentanol, and m-cresol.

Tonicity agents, sometimes known as “stabilizers” are present to adjustor maintain the tonicity of liquid a composition. When used with large,charged biomolecules such as proteins and antibodies, they are oftentermed “stabilizers” because the can interact with the charged groups ofthe amino acid side chains, thereby lessening the potential for interand intra-molecular interactions. Tonicity agents can be present in anyamount between 0.1% to 25% by weight, preferably 1 to 5%, taking intoaccount the relative amounts of the other ingredients. Preferredtonicity agents include polyhydric sugar alcohols, preferably trihydricor higher sugar alcohols, such as glycerin, erythritol, arabitol,xylitol, sorbitol and mannitol.

Additional excipients include agents which can serve as one or more ofthe following: (1) bulking agents, (2) solubility enhancers, (3)stabilizers and (4) and agents preventing denaturation or adherence tothe container wall. Such excipients include: polyhydric sugar alcohols(enumerated above); amino acids such as alanine, glycine, glutamine,asparagine, histidine, arginine, lysine, ornithine, leucine,2-phenylalanine, glutamic acid, threonine, etc.; organic sugars or sugaralcohols such as sucrose, lactose, lactitol, trehalose, stachyose,mannose, sorbose, xylose, ribose, ribitol, myoinisitose, myoinisitol,galactose, galactitol, glycerol, cyclitols (e.g., inositol),polyethylene glycol; sulfur containing reducing agents, such as urea,glutathione, thioctic acid, sodium thioglycolate, thioglycerol,α-monothioglycerol and sodium thio sulfate; low molecular weightproteins such as human serum albumin, bovine serum albumin, gelatin orother immunoglobulins; hydrophilic polymers such aspolyvinylpyrrolidone; monosaccharides (e.g., xylose, mannose, fructose,glucose; disaccharides (e.g., lactose, maltose, sucrose); trisaccharidessuch as raffinose; and polysaccharides such as dextrin or dextran.

Non-ionic surfactants or detergents (also known as “wetting agents”) arepresent to help solubilize the therapeutic agent as well as to protectthe therapeutic protein against agitation-induced aggregation, whichalso permits the formulation to be exposed to shear surface stresswithout causing denaturation of the active therapeutic protein orantibody. Non-ionic surfactants are present in a range of about 0.05mg/ml to about 1.0 mg/ml, preferably about 0.07 mg/ml to about 0.2mg/ml.

Suitable non-ionic surfactants include polysorbates (20, 40, 60, 65, 80,etc.), polyoxamers (184, 188, etc.), Pluronic® polyols, Triton®,polyoxyethylene sorbitan monoethers (Tween®-20, Tween®-80, etc.),lauromacrogol 400, polyoxyl 40 stearate, polyoxyethylene hydrogenatedcastor oil 10, 50 and 60, glycerol monostearate, sucrose fatty acidester, methyl celluose and carboxymethyl cellulose. Anionic detergentsthat can be used include sodium lauryl sulfate, dioctyle sodiumsulfosuccinate and dioctyl sodium sulfonate. Cationic detergents includebenzalkonium chloride or benzethonium chloride.

In order for the formulations to be used for in vivo administration,they must be sterile. The formulation may be rendered sterile byfiltration through sterile filtration membranes. The therapeuticcompositions herein generally are placed into a container having asterile access port, for example, an intravenous solution bag or vialhaving a stopper pierceable by a hypodermic injection needle.

The route of administration is in accordance with known and acceptedmethods, such as by single or multiple bolus or infusion over a longperiod of time in a suitable manner, e.g., injection or infusion bysubcutaneous, intravenous, intraperitoneal, intramuscular,intraarterial, intralesional or intraarticular routes, topicaladministration, inhalation or by sustained release or extended-releasemeans.

The formulation herein may also contain more than one active compound asnecessary for the particular indication being treated, preferably thosewith complementary activities that do not adversely affect each other.Alternatively, or in addition, the composition may comprise a cytotoxicagent, cytokine or growth inhibitory agent. Such molecules are suitablypresent in combination in amounts that are effective for the purposeintended.

The active ingredients may also be entrapped in microcapsules prepared,for example, by coacervation techniques or by interfacialpolymerization, for example, hydroxymethylcellulose orgelatin-microcapsules and poly-(methylmethacylate) microcapsules,respectively, in colloidal drug delivery systems (for example,liposomes, albumin microspheres, macroemulsions, nano-particles andnanocapsules) or in macroemulsions. Such techniques are disclosed inRemington's Pharmaceutical Sciences 18th edition, supra.

Sustained-release preparations may be prepared. Suitable examples ofsustained-release preparations include semipermeable matrices of solidhydrophobic polymers containing the antibody, which matrices are in theform of shaped articles, e.g. films, or microcapsules. Examples ofsustained-release matrices include polyesters, hydrogels (for example,poly(2-hydroxyethyl-methacrylate), or poly(vinylalcohol)), polylactides(U.S. Pat. No. 3,773,919), copolymers of L-glutamic acid andγ-ethyl-L-glutamate, non-degradable ethylene-vinyl acetate, degradablelactic acid-glycolic acid copolymers such as the LUPRON DEPOT™(injectable microspheres composed of lactic acid-glycolic acid copolymerand leuprolide acetate), and poly-D-(−)-3-hydroxybutyric acid.Microencapsulation of recombinant proteins for sustained release hasbeen successfully performed with human growth hormone (rhGH),interferon- (rhIFN-), interleukin-2, and MN rpg 120. Johnson et al.,Nat. Med. 2: 795-799 (1996); Yasuda et al., Biomed. Ther. 27: 1221-1223(1993); Hora et al., Bio/Technology 8: 755-758 (1990); Cleland, “Designand Production of Single Immunization Vaccines Using PolylactidePolyglycolide Microsphere Systems,” in Vaccine Design: The Subunit andAdjuvant Approach, Powell and Newman, eds., (Plenum Press: New York,1995), pp. 439-462; WO 97/03692; WO 96/40072; WO 96/07399; and U.S. Pat.No. 5,654,010.

The sustained-release formulations of these proteins may be developedusing poly lactic-coglycolic acid (PLGA) polymer due to itsbiocompatibility and wide range of biodegradable properties. Thedegradation products of PLGA, lactic and glycolic acids, can be clearedquickly within the human body. Moreover, the degradability of thispolymer can be adjusted from months to years depending on its molecularweight and composition. Lewis, “Controlled release of bioactive agentsfrom lactide/glycolide polymer”, in Biodegradable Polymers as DrugDelivery Systems (Marcel Dekker; New York, 1990), M. Chasin and R.Langer (Eds.) pp. 1-41.

While polymers such as ethylene-vinyl acetate and lactic acid-glycolicacid enable release of molecules for over 100 days, certain hydrogelsrelease proteins for shorter time periods. When encapsulated antibodiesremain in the body for a long time, they may denature or aggregate as aresult of exposure to moisture at 37° C., resulting in a loss ofbiological activity and possible changes in immunogenicity. Rationalstrategies can be devised for stabilization depending on the mechanisminvolved. For example, if the aggregation mechanism is discovered to beintermolecular S—S bond formation through thio-disulfide interchange,stabilization may be achieved by modifying sulfhydryl residues,lyophilizing from acidic solutions, controlling moisture content, usingappropriate additives, and developing specific polymer matrixcompositions.

Liposomal or proteinoid compositions may also be used to formulate theproteins or antibodies disclosed herein. See U.S. Pat. Nos. 4,925,673and 5,013,556.

Stability of the proteins and antibodies described herein may beenhanced through the use of non-toxic “water-soluble polyvalent metalsalts”. Examples include Ca²⁺, Mg²⁺, Zn²⁺, Fe²⁺, Fe³⁺, Cu²⁺, Sn²⁺, Sn⁴⁺,Al²⁺ and Al³⁺. Example anions that can form water soluble salts with theabove polyvalent metal cations include those formed from inorganic acidsand/or organic acids. Such water-soluble salts have a solubility inwater (at 20° C.) of at least about 20 mg/ml, alternatively at leastabout 100 mg/ml, alternative at least about 200 mg/ml.

Suitable inorganic acids that can be used to form the “water solublepolyvalent metal salts” include hydrochloric, acetic, sulfuric, nitric,thiocyanic and phosphoric acid. Suitable organic acids that can be usedinclude aliphatic carboxylic acid and aromatic acids. Aliphatic acidswithin this definition may be defined as saturated or unsaturated C₂₋₉carboxylic acids (e.g., aliphatic mono-, di- and tri-carboxylic acids).For example, exemplary monocarboxylic acids within this definitioninclude the saturated C₂₋₉ monocarboxylic acids acetic, proprionic,butyric, valeric, caproic, enanthic, caprylic pelargonic and capryonic,and the unsaturated C₂₋₉ monocarboxylic acids acrylic, propriolicmethacrylic, crotonic and isocrotonic acids. Exemplary dicarboxylicacids include the saturated C₂₋₉ dicarboxylic acids malonic, succinic,glutaric, adipic and pimelic, while unsaturated C₂₋₉ dicarboxylic acidsinclude maleic, fumaric, citraconic and mesaconic acids. Exemplarytricarboxylic acids include the saturated C₂₋₉ tricarboxylic acidstricarballylic and 1,2,3-butanetricarboxylic acid. Additionally, thecarboxylic acids of this definition may also contain one or two hydroxylgroups to form hydroxy carboxylic acids. Exemplary hydroxy carboxylicacids include glycolic, lactic, glyceric, tartronic, malic, tartaric andcitric acid. Aromatic acids within this definition include benzoic andsalicylic acid.

Commonly employed water soluble polyvalent metal salts which may be usedto help stabilize the encapsulated polypeptides of this inventioninclude, for example: (1) the inorganic acid metal salts of halides(e.g., zinc chloride, calcium chloride), sulfates, nitrates, phosphatesand thiocyanates; (2) the aliphatic carboxylic acid metal salts (e.g.,calcium acetate, zinc acetate, calcium proprionate, zinc glycolate,calcium lactate, zinc lactate and zinc tartrate); and (3) the aromaticcarboxylic acid metal salts of benzoates (e.g., zinc benzoate) andsalicylates.

E. Methods of Treatment:

For the prevention or treatment of disease, the appropriate dosage of anactive agent, will depend on the type of disease to be treated, asdefined above, the severity and course of the disease, whether the agentis administered for preventive or therapeutic purposes, previoustherapy, the patient's clinical history and response to the agent, andthe discretion of the attending physician. The agent is suitablyadministered to the patient at one time or over a series of treatments.

A preferred method of treatment is the treatment of IgE-mediateddisorders. IgE mediated disorders includes atopic disorders, which arecharacterized by an inherited propensity to respond immunologically tomany common naturally occurring inhaled and ingested antigens and thecontinual production of IgE antibodies. Specific atopic disordersincludes allergic asthma, allergic rhinitis, atopic dermatitis andallergic gastroenteropathy. Atopic patients often have multipleallergies, meaning that they have IgE antibodies to, and symptoms from,many environmental allergens, including pollens, fungi (e.g., molds),animal and insect debris and certain foods.

However disorders associated with elevated IgE levels are not limited tothose with an inherited (atopic) etiology. Other disorders associatedwith elevated IgE levels, that appear to be IgE-mediated and aretreatable with the formulations of this present invention includehypersensitivity (e.g., anaphylactic hypersensitivity), eczema,urticaria, allergic bronchopulmonary aspergillosis, parasitic diseases,hyper-IgE syndrome, ataxia-telangiectasia, Wiskott-Aldrich syndrome,thymic alymphoplasia, IgE myeloma and graft-versus-host reaction.

Allergic rhinitis, also known as allergic rhinoconjunctivitis or hayfever, is the most common manifestation of an atopic reaction to inhaledallergens, the severity and duration of which is often correlative withthe intensity and length of exposure to the allergen. It is a chronicdisease, which may first appear at any age, but the onset is usuallyduring childhood or adolescence. A typical attack consists of profusewatery rhinorrhea, paroxysmal sneezing, nasal obstruction and itching ofthe nose and palate. Postnasal mucus drainage also causes sore throat,throat clearing and cough. There can also be symptoms of allergicblepharoconjunctivitis, with intense itching of the conjunctivae andeyelids, redness, tearing, and photophobia. Severe attacks are oftenaccompanied by systemic malaise, weakness, fatigue, and sometime, musclesoreness after intense periods of sneezing.

Asthma, also known as reversible obstructive airway disease, ischaracterized by hyperresponsiveness of the tracheobronchial tree torespiratory irritants and bronchoconstrictor chemicals, producingattacks of wheezing, dyspnea, chest tightness, and cough that arereversible spontaneously or with treatment. It is a chronic diseaseinvolving the entire airway, but varies in severity from occasional mildtransient episodes to severe, chronic, life-threatening bronchialobstruction. Asthma and atopy may coexhist, but only about half ofasthmatics are also atopic, and an even smaller percentage of atopicpatients also have asthma. However, atopy and asthma are not entirelyindependent in that asthma occurs more frequently among atopic thanamongst nonatopic individuals, especially during childhood. Asthma hasfurther been historically broken down into two subgroups, extrinsicasthma and intrinsic asthma.

Extrinsic asthma, also known as allergic, atopic or immunologic asthma,is descriptive of patients that generally develop asthma early in life,usually during infancy or childhood. Other manifestations of atopy,including eczema or allergic rhinitis often coexist. Asthmatic attackscan occur during pollen seasons, in the presence of animals, or onexposure to house dust, feather pillows, or other allergens. Skin testsshow positive wheal-and-flare reactions to the causative allergens.Interestingly, total serum IgE concentrations is frequently elevated,but is sometimes normal.

Intrinsic asthma, also known as nonallergic or idopathic asthma,typically first occurs during adult life, after and apparent respiratoryinfection. Symptoms include chronic or recurrent bronchial obstructionunrelated to pollen seasons or exposure to other allegens. Skin testsare negative to the usual atopic allergens, serum IgE concentration isnormal. Additional symptoms include sputum blood and eosinophilia. Otherschemes for classifying asthma into subgroups, like aspirin-sensitive,exercise-induced, infectious and psychologic merely define externaltriggering factors that affect certain patients more so than others.

Finally, it is important to note that while some classifications havehistorically associated only allergic asthma with IgE dependency, thereis now strong statistically significant data showing a correlationbetween IgE and asthma (both allergic and non-allergic). Chapter 27,“The Atopic Diseases”, A. I. Terr in Medical Immunology, 9th Ed., Simonand Schuster, Stites et al, Ed. (1997). As a result, the term“IgE-mediated disorders”, for purposes of this patent application,includes both allergic and non-allergic asthma.

Physical signs of an asthma attack include tachypnea, audible wheezing,and use of the accessory muscles of respiration. Rapid pulse andelevated blood pressure are also typically present, as are elevatedlevels of eosinophils in the peripheral blood and nasal secretions.Pulmonary functions show a decrease in flow rates and 1 second forcedexpiratory volume (FEV₁). The total lung capacity and functionalresidual capacity are typically normal or slightly increased, but may bedecreased with extreme bronchospasm.

The pathology of asthma can be distinguished by early phase and latephase reactions. The early phase is characterized by smooth musclecontraction, edema and hypersecretion, while the late phase reactions bycellular inflammation. Asthma can be induced by various non-specifictriggers including infections (e.g., viral respiratory infections),physiologic factors (e.g., exercise, hyperventilation, deep breathing,psychologic factors), atmospheric factors (e.g., sulfur dioxide,ammonia, cold air, ozone, distilled water vapor), ingestants (e.g.,propranolol, aspirin, nonsteroidal anti-inflammatory drugs),experimental inhalants (e.g., hypertonic solutions, citric acid,histamine, methacholine, prostaglandin F_(2α)) and occupationalinhalants (e.g., isocyantes). Various additional occupational orenvironmental allergens that cause allergic asthma can include, animalproducts, insect dusts, sea creatures, plant products, fruits, seeds,leaves and pollens, organic dyes and inks, microbial agents, enzymes,therapeutic agents, sterilizing agents, inorganic and organic chemicals.

Atopic dermatitis, also known as eczema, neurodermatitis, atopic eczemaor Besnier's prurigo, is common chronic skin disorder specific to asubset of patients with the familial and immunologic features of atopy.The essential feature is a pruritic dermal inflammatory response, whichinduces a characteristic symmetrically distributed skin eruption withpredilection for certain sites. There is also frequent overproduction ofIgE by B lymphocytes. While atopic dermatitis is classified as acutaneous form of atopy because it is associated with allergic rhinitisand asthma and high IgE levels, the severity of the dermatitis, however,does not always correlate with exposure to allergens on skin testing,and desensitization (unlike other allergic diseases) is not effectivetreatment. While high serum IgE is confirmatory of a diagnosis ofallergic asthma, normal levels do not preclude it. Onset of the diseasecan occur at any age, and lesions begin acutely with erythematousedematous papule or plaque with scaling. Itching leads to weeping andcrusting, then to chronic lichenification. On the cellular level, acutelesion is edemous and the dermis is infiltrated with mononuclear cells,CD4 lymphocytes. Neutrophils, eosinophils, plasma cells and basophilsare rare, but degranulated mast cells are present. Chronic lesionsfeature epidermal hyperplasia, hyperkeratosis and parakeratosis, and thedermis is infiltrated with mononuclear cells, Langerhans' cells and mastcells. There may also be focal areas of fibrosis, including involvementof the perineurium of small nerves.

Allergic gastroenteropathy, also known as eosinophilicgastroenteropathy, is an unusual atopic manifestation in which multipleIgE food sensitivities are associated with a local gastrointestinaltract mucosal reaction. It is rare in adults, but more common, buttransient, in infants. The condition results when ingested foodallergens react with local IgE antibodies in the jejunal mucosa liberatemast cell mediators, resulting in gastrointestinal symptoms shortlyafter the meal. Continued exposure produced chronic inflammation,resulting in gastrointestinal proteins loss and hypoproteinemic edema.Blood loss through the inflamed intestinal mucosa may be significantenough to cause iron deficiency anemia. The allergic reaction occurslocally in the upper gastrointestinal mucosa following allergenexposure, but resolves with allergen avoidance.

Anaphylaxis and urticaria are clearly IgE-mediated, but they lackgenetic determinants, and have no predilection for atopic individuals.Anaphylaxis is an acute, generalized allergic reaction with simultaneousinvolvement of several organ systems, usually cardiovascular,respiratory, cutaneous and gastrointestinal. The reaction isimmunologically mediated, and it occurs on exposure to an allergen towhich the subject has been previously sensitized. Urticaria andangioedema refers to the physical swelling, erythema and itchingresulting from histamine stimulated receptor in superficial cutaneousblood vessels, and is the hallmark cutaneous feature of systemicanaphylaxis. Systemic anaphylaxis is the occurrence of an IgE-mediatedreaction simultaneously in multiple organs resulting from drug, insectvenom or food. It is caused suddenly by allergen induced, mast cellloaded IgE, resulting in profound and life-threatening alteration in thefunctioning of various vital organs. Vascular collapse, acute airwayobstruction, cutaneous vasodilation and edema, and gastrointestinal andgenitourinary muscle spasm occur almost simultaneously, although notalways to the same degree.

The pathology of anaphylaxis includes angioedema and hyperinflatedlungs, with mucous plugging of airways and focal atelectasis. On acellular level, the lungs appear similarly as during an acute asthmaattack, with hypersecretion of bronchial submucosal glands, mucosal andsubmucosal edema, peribronchial vascular congestion and eosinophilia inthe bronchial walls. Pulmonary edema and hemorrhage may be present.Bronchial muscle spasm, hyperinflation, and even rupture of alveoli mayalso be present. Important feature of human anaphylaxis include edema,vascular congestion, and eosinophilia in the lamina propria of thelarynx, trachea, epiglottis and hypopharynx. Exposure to the allergenmay be through ingestion, injection, inhalation or contct with skin ormucous membrane. The reaction begins within seconds or minutes afterexposure to the allergen. There may be an initial fright or sense ofimpending doom, followed rapidly by symptoms in one or more target organsystems: cardiovascular, respiratory, cutaneous and gastrointestinal.

The allergens responsible for anaphylaxis differ from those commonlyassociated with atopy. Foods, drugs, insect venoms or latex are thecommon sources. Food allergens includes those fond in crustaceans,mollusks (e.g., lobster, shrimp, crab), fish, legumes (e.g., peanuts,peas, beans, licorice), seeds (e.g. sesame, cottonseed, caraway, mustar,flaxseed, sunflower), nuts, berries, egg whites, buckwheat and milk.Drug allergens include those found in heterologous proteins andpolypeptides, polysaccharides and haptenic drugs. Insect allergensinclude Hymenoptera insects, including the honeybee, yellow jacket,hornet, wasp and fire ant.

While epinephrine is the typical treatment for anaphylaxis,antihistamine or other histamine blockers are typically prescribed forless severe urticaria or angioedemic reaction.

F. Combination Therapies

The method of the invention can be combined with known methods oftreatment for IgE-mediated disorder, either as combined or additionaltreatments steps or as additional components of a therapeuticformulation.

For example, antihistamines, especially non-sedating antihistamines maybe administered before, prior to, or commensurate with the anti-IgEantibodies of the invention. Suitable antihistamines include those ofthe alkylamine (e.g., chlorpheniramine), ethanolamine (e.g.,diphenhydramine) and phenothiazine (e.g., promethazine). While manyantihistamines antagonize the pharmacological effects of histamine byblocking its receptor sites on the effector cells; other commonantihistamine drugs operate by blocking histamine release from mastcells that have been sensitized and armed with allergen-specific IgE(e.g., cromolyn sodium). Example antihistamines include astemizole,azatadine maleate, bropheniramine maleate, carbinoxamine maleate,cetirizine hydrochloride, clemastine fumarate, cyproheptadinehydrochloride, dexbrompheniramine maleate, dexchlorpheniramine maleate,dimenhydrinate, diphenhydramine hydrochloride, doxylamine succinate,fexofendadine hydrochloride, terphenadine hydrochloride, hydroxyzinehydrochloride, loratidine, meclizine hydrochloride, tripelannaminecitrate, tripelennamine hydrochloride, triprolidine hydrochloride.

Particular symptoms of IgE-mediated disorders (e.g., early phasereactions) can be ameliorated with sympathomimetics or drugs havingbronchodialator effect. Epinephrine is a broad acting alpha andbeta-adrenergic often administered subcutaneously in a does of 0.2-0.5mL of 1:100 aqueous solution. A longer acting form of epinephrine (i.e.,terbutaline) in 1:200 suspension is also used when a longer durationeffect is desired. Suitable additional beta-adrenergics includealbuterol, pirbuterol, metaproterenol, salmeterol, isoetharine andformoterol for administration nasally (e.g., hand-held nebulizer,intermittent positive-pressure breathing device, or metered-dosepressurized inhalers) or orally.

Bronchodilation can also be achieved through administration ofxanthines, especially when they are administered in combination with theabove sympathomimetic drugs. Example xanthines include aminophylline(iv. 250-500 mg) and theophylline (oral, 10-20 μg/ml serumconcentration).

Other symptoms from various IgE-mediated disorders (e.g., late phasereactions) can be attenuated by treatment with glucocorticoids or otherdrugs having anti-inflammatory effects. Prednisone (30-60 mg daily) isadministered systemically for severe attacks, while beclomethasonedipropionate, triamcinolone acetonide and flunisolide are administeredin aerosolized form as long-term maintenance therapy. Additionalycoricosteroids that have anti-inflammatory effects include:betamethasone, budesonide, dexamethasone, fludrocortisone acetate,flunisolide, fluticasone propionate, hydrocortisone, methylprednisolone,prednisolone, prednisone, triamcinolone.

Non-steroidal anti-inflammatory drugs that may also be used incombination with the therapeutic methods of the invention include,acetaminophen, aspirin, bromfenac sodium, diclofenac sodium, diflunisal,etodolac, fenoprofen calcium, flurbiprofen, ibuprofen, indomethacin,ketoprofen, meclofenamate sodium, mefenamic acid, nabumetone, naproxen,naproxen sodium, oxyphenbutazone, phenylbutzone, piroxicam, sulindac,tolmetin sodium.

Additionally, the maximum therapeutic benefit may also be achieved withthe administration of decongestants (e.g., phenylephrine,phenylpropanolamine, pseudoephadrin), cough suppressants (e.g.,dextromethorphan, codeine, or hydrocodone) or analgesic (e.g.,acetaminophen, aspirin).

Allergen desensitization is a treatment form in which allergens areinjected into the patient for the purpose or reducing or eliminating theallergic response. It is also known as allergen immunotherapy,hyposensitization or allergy injection therapy. It is often used incombination with other allergy treatments, but not often as a primarytreatment. It has been successful employed when allergen avoidance isimpossible. A typical allergen desensitization treatment incorporatessubcutaneous injection of sterile allergen in increasing doses once ortwice a week until a dose is achieved that produces a transient smalllocal area of inflammation at the injection site. The does is then givenon a maintenance schedule once every 2-4 weeks. Allergic desensitizationis most often used in the treatment of allergic asthma and allergicrhinitis, althought is has had success in treating anaphylaxis.Desensitization has also been effectively used through the use ofadjuvants, such as incomplete Freund's adjuvant, which is an emulsion ofaqueous antigen in mineral oil. The physiological effect creates aninsoluble liquid depot from which droplets of allergen are graduallyreleased. Another form of allergen desensitization is to polymerizemonomeric allergens with glutaraldehyde to create a molecule withrelatively low allergenity (i.e., causes allergic response), whileretaining an effective degree of immunogenicity.

G. Pharmaceutical Dosages:

Dosages and desired drug concentration of pharmaceutical compositions ofthe present invention may vary depending on the particular useenvisioned. The determination of the appropriate dosage or route ofadministration is well within the skill of an ordinary artisan. Animalexperiments provide reliable guidance for the determination of effectivedoses for human therapy. Interspecies scaling of effective doses can beperformed following the principles laid down by Mordenti, J. andChappell, W. “The Use of Interspecies Scaling in Toxicokinetics,” InToxicokinetics and New Drug Development, Yacobi et al., Eds, PergamonPress, New York 1989, pp. 42-46.

When in vivo administration of the polypeptides or antibodies describedherein are used, normal dosage amounts may vary from about 10 ng/kg upto about 100 mg/kg of mammal body weight or more per day, preferablyabout 1 mg/kg/day to 10 mg/kg/day, depending upon the route ofadministration. Guidance as to particular dosages and methods ofdelivery is provided in the literature; see, for example, U.S. Pat. Nos.4,657,760; 5,206,344; or 5,225,212. It is within the scope of theinvention that different formulations will be effective for differenttreatments and different disorders, and that administration intended totreat a specific organ or tissue may necessitate delivery in a mannerdifferent from that to another organ or tissue. Moreover, dosages may beadministered by one or more separate administrations, or by continuousinfusion. For repeated administrations over several days or longer,depending on the condition, the treatment is sustained until a desiredsuppression of disease symptoms occurs. However, other dosage regimensmay be useful. The progress of this therapy is easily monitored byconventional techniques and assays.

H. Administration of the Formulation

The formulations of the present invention, including but not limited toreconstituted formulations, are administered to a mammal in need oftreatment with the protein, preferably a human, in accord with knownmethods, such as intravenous administration as a bolus or by continuousinfusion over a period of time, by intramuscular, intraperitoneal,intracerobrospinal, subcutaneous, intra-articular, intrasynovial,intrathecal, oral, topical, or inhalation routes.

In preferred embodiments, the formulations are administered to themammal by subcutaneous (i.e. beneath the skin) administration. For suchpurposes, the formulation may be injected using a syringe. However,other devices for administration of the formulation are available suchas injection devices (e.g. the Inject-Ease™ and Genject™ devices);injector pens (such as the GenPen™); auto-injector devices, needlelessdevices (e.g. MediJector™ and BioJector™); and subcutaneous patchdelivery systems.

In a specific embodiment, the present invention is directed to kits fora single dose-administration unit. Such kits comprise a container of anaqueous formulation of therapeutic protein or antibody, including bothsingle or multi-chambered pre-filled syringes. Exemplary pre-filledsyringes are available from Vetter GmbH, Ravensburg, Germany.

The appropriate dosage (“therapeutically effective amount”) of theprotein will depend, for example, on the condition to be treated, theseverity and course of the condition, whether the protein isadministered for preventive or therapeutic purposes, previous therapy,the patient's clinical history and response to the protein, the type ofprotein used, and the discretion of the attending physician. The proteinis suitably administered to the patient at one time or over a series oftreatments and may be administered to the patient at any time fromdiagnosis onwards. The protein may be administered as the sole treatmentor in conjunction with other drugs or therapies useful in treating thecondition in question.

Where the protein of choice is an antibody, from about 0.1-20 mg/kg isan initial candidate dosage for administration to the patient, whether,for example, by one or more separate administrations. However, otherdosage regimens may be useful. The progress of this therapy is easilymonitored by conventional techniques.

Uses for an anti-IgE formulation (e.g., rhuMAbE-25, rhMAbE-26, Hu-901)include the treatment or prophylaxis of IgE-mediated allergic diseases,parasitic infections, interstitial cystitis and asthma, for example.Depending on the disease or disorder to be treated, a therapeuticallyeffective amount (e.g. from about 1-15 mg/kg) of the anti-IgE antibodyis administered to the patient.

I. Articles of Manufacture

In another embodiment of the invention, an article of manufacture isprovided which contains the formulation and preferably providesinstructions for its use. The article of manufacture comprises acontainer. Suitable containers include, for example, bottles, vials(e.g. dual chamber vials), syringes (such as single or dual chambersyringes) and test tubes. The container may be formed from a variety ofmaterials such as glass or plastic. The container holds the formulationand the label on, or associated with, the container may indicatedirections for reconstitution and/or use. The label may further indicatethat the formulation is useful or intended for subcutaneousadministration. The container holding the formulation may be a multi-usevial, which allows for repeat administrations (e.g. from 2-6administrations) of the reconstituted formulation. The article ofmanufacture may further comprise a second container comprising asuitable diluent (e.g. BWFI). Upon mixing of the diluent and thelyophilized formulation, the final protein concentration in thereconstituted formulation will generally be at least 50 mg/ml. Thearticle of manufacture may further include other materials desirablefrom a commercial and user standpoint, including other buffers,diluents, filters, needles, syringes, and package inserts withinstructions for use.

The invention will be more fully understood by reference to thefollowing examples. They should not, however, be construed as limitingthe scope of the invention. All citations throughout the disclosure arehereby expressly incorporated by reference.

In another embodiment, the invention provides for an anticle ofmanufacture comprising the formulations described herein foradministration in an auto-injector device. An auto-injector can bedescribed as an injection device that upon activation, will deliver itscontents without additional necessary action from the patient oradministrator. They are particularly suited for self-medication oftherapeutic formulations when delivery rate must be constant and thetime of delivery is greater than a few moments.

EXAMPLE 1 Preparation of Anti-IgE rhuMAbE25 (“E25”) Formulation

Formulations of the monoclonal anti-IgE antibody rhuMAbE25 were preparedfrom E25 bulk residual Lot K9094A (40 mg/ml rhuMAb E25, 85 mM trehalose,5 mM histidine, pH 6, 0.01% Tween 20) or rhuMAbE25 Q-Pool (5 mg/mlrhuMAb E25, 25 mM Tris, 200 mM NaCl).

Aqueous solutions of rhuMAbE25 was prepared by dialysis into differentbuffers (20 mM His-HCl and 200 mM Arg-HCl, pH 6.0) at 2-8° C. using aSlide-A-Lyzer Dialysis Cassette (Pierce). The samples were thentransferred into the sample reservoir of a Centricon-30 centrifugalmicroconcentrators (Amicon). The proteins were concentrated by spinningthe Centricon-3 concentrator at 4000-5000 g until the desired proteinconcentration is achieved.

The samples were then concentrated to ˜150 mg/ml of rhuMAb E25 usingultrafiltration. Tween 20 was added to each preparation to a finalconcentration of 0.02%. All formulations were filtered, asepticallyfilled into 3 cc FormaVitrum vials and stoppered with 13-mM Diakyostoppers in a Class 100 room.

EXAMPLE 2 Method and Materials

Stability Studies:

All formulations were filled at 1 ml in 3 cc FormaVitrum glass vials andstoppered with 13-mm Diakyo stoppers in a Class 100 sterile fillingsuite. Vials were placed at −70, 2-8, 15, 30 and 40° C. in lightimpermeable containers.

Agitation Study:

Aliquots of each formulation were placed in the glass vials. Vials wereagitated horizontally on a Glas-Col Bench Top Shaker at roomtemperature. The shaker was set at 70 with an arm length of 30 cm(maximum). After agitation, samples were inspected and analyzedaccording to the following protocol.

Freeze-Thawing Study:

Samples of E25 underwent three cycles of freeze-thaw. Each cycleconsisted of freezing at −70° C. overnight and subsequently thawing atroom temperature for about one hour. After each cycle, samples wereinspected visually using a light box to assess the color and clarity ofthe liquid. Turbidity and soluble aggregates were measured following theprotocol described below.

Analytical Methods:

Stability samples were analyzed by the methods outlined in Table 1

TABLE 1 Analytical Methods Assay Purpose Color, Clarity, Appearance^(a)Visual inspection of liquid formulations Size Exclusion Chromatography(SEC)^(b) Measures % monomer, soluble aggregates and low molecularweight components Hydrophobic Interaction Chromatography Measures levelof Asp-32 isomerization and (HIC)^(c) free thiol UV Spec Scan(Gravimetric)^(f) Measures protein concentration Turbidity (Mean OD340-360 nm)^(d) Measures soluble and insoluble aggregates Activity^(e)Determines binding activity of anti-IgE ^(a)Pass for Color, Appearanceand Clarity: The color, appearance and clarity of the sample werevisually assessed against the white and black background of theinspection and compared to an equal volume of negative control. Samplesshould be carefully swirled to ensure homogenous mixing, but not sovigorously so as to create air bubbles. ^(b)Size ExclusionChromatography: A TSK SUPER SW3000 (4.6 × 300 mm) column was used in anHP 1100 chromatography system. The column was loaded with 20 μg proteinand eluted in 0.1M potassium phosphate, pH 6.8. The sample was measuredat 280 nm by a UV detector. ^(c)Hydrophobic Interaction Chromatography(HIC): The HIC experiments were conducted using a TSK Phenyl-5PW (7.5 ×75 mm) column (TosoHaas) on an HP 1100 liquid chromatography system. Thecolumn was loaded with 28 μg of papain digested Fab fragments and elutedwith a concentration gradient of ammonium sulfate in 20 mM Tris bufferfrom 2M to 0M. The peaks were monitored at 210 nm by a UV detector.^(d)Turbidity: The turbidity of samples were determined in a 1-cm pathlength cuvette using a HP spectrometer. The turbidity was calculated asthe average absorbance from 340-360 nm. ^(e)The activity of the anti-IgEmonoclonal antibody was determined by a receptor binding inhibitionassay. Samples were diluted to fall within the range of the standardcurve from 100 and 1.56 μg/ml in an assay diluent containing phosphstebuffer, 0.5% BSA, 0.05% polysorbate 20, 0.01% Thimerosol. A microtiterplate was coated with IgE receptor, then incubated with the IgE-biotinand diluted anti-IgE sample. The amount of IgE-Biotin bound to thereceptor that correlated with activity of anti-IgE monoclonal antibodywas measured using Streptavidin-HRP. The data were analyzed using a4-parameter logistic curve-fitting program. ^(f)The concentration ofantibody was obtained on a Hewlett Packard 8453 diode arrayspectrophotometer with a 1-cm quartz cuvetter. The concentration wascalculated using an absorptivity of 1.5 cm⁻¹ (mg/ml).⁻¹Summary of Liquid Formulations

Buffer/ Excipients/ Formulations Protein Ranges Ranges Ranges 80 mg/mlE25 40-150 mg/ml His-HCl or Trehalose 50 mM Histidine-HCl His-Acetate orSucrose 150 mM Trehalose Ranges: Sugar Ranges: 0.05% Polysorbate 20 10mM- 20 mM-350 mM pH 6.0 100 mM Polysorbate: 0.01%-0.1% 150 mg/ml E2540-260 mg/ml His-HCl or ArgHCl Ranges: 20 mM Histidine-HCl His-Acetate50 mM-200 mM 200 mM ArgHCl Ranges: Polysorbate: 0.02% Polsorbate 20 10mM- 0.01%-0.1% pH 6.0 100 mMStability Data for 150 mg/ml E25 in Histidine and ArgHCl Formulation

Temp Time Vi- SEC ^(a) % HIC ^(b) % Poten- Turbid- (° C.) (months) sualpH Monomer of Main cy ^(c) ity ^(d) 5 0 pass 6.2 99.0 64 106 0.25 1 pass6.0 99.2 63 100 0.27 3 pass 6.0 99.3 63 111 0.25 16 pass 6.0 98.9 62 830.27 30 1 pass 5.9 98.43 54 91 0.25 3 Pass 6.1 97.53 42 65 0.30 16 Pass6.0 90.63 19 28 0.54Stability Data for 80 mg/ml E25 in Histidine and Trehalose Formulation

Temp Time Vi- SEC ^(a) % HIC ^(b) % Poten- Turbid- (° C.) (Months) sualpH Monomer Main cy ^(c) ity ^(d) 5 0 Pass 5.7 99.1 64 100 0.20 1 Pass5.8 98.7 63 92 0.20 3 Pass 5.7 98.8 63 124 0.20 6 Pass 5.7 99.1 63 970.21 14 Pass 5.7 99.0 62 83 0.21 24 Pass 5.7 98.8 62 84 0.20 30 1 Pass5.8 98.7 55 77 0.20 3 Pass 5.7 97.4 41 76 0.29 6 Pass 5.8 95.5 31 480.38 14 Pass 5.7 93.1 22 30 0.48 ^(a) Size exclusion chromatography formeasuring soluble aggregates and fragments ^(b) Hydrophobic interactionchromatography for papain digested E25. ^(c) IgE receptor bindinginhibition assay ^(d) Mean OD (340-360 nm)Agitation Study:

TO Shaking after 3 days Formu- SEC (% Tur- SEC (% Tur- lation VisualMonomer) bidity Visual Monomer) bidity 1 Pass 99.5 0.18 pass 99.3 0.18 2Pass 99.0 0.19 pass 99.4 0.19 Formulation 1: 156 mg/ml E25, 200 mMArgCl, 23 mM His, 0.02% T20 Formulation 2: 150 mg/ml E25, 182 mM ArgCl,20 mM His, 0.02% T20Freeze Thawing Study:

TO After 1 st Cycle After 3 rd Cycle SEC % SEC % SEC % FormulationVisual Monomer Turbidity Visual Monomer Turbidity Visual MonomerTurbidity 1 pass 99.5 0.18 pass 99.3 0.17 pass 99.4 0.17 2 pass 99.00.19 pass 99.2 0.19 pass 99.2 0.18 Formulation 1: 156 mg/ml E25, 200 mMArgCl, 23 mM His, 0.02% T20 Formulation 2: 150 mg/ml E25, 182 mM ArgCl,20 mM His, 0.02% T20

EXAMPLE 3

Samples of the anti-IgE monoclonal antibody (E26) liquid formulationswere prepared in 20 mM buffers and then stored at 30° C. and 40° C. Thestability of E26 was determined by chromatography and activitymeasurements. The size exclusion chromatography was used for determiningthe soluble aggregates, and the hydrophobic interaction chromatographyof pepsin digested sample was used for measuring isomerization. Theactivity of sample was monitored by using an IgE receptor bindinginhibition assay. As shown in FIGS. 1, 2 and 3, the degradation of E26is highly dependent on pH of buffers. The E26 appears to be most stablearound pH 6.0.

EXAMPLE 4

The particulate formulation is a major challenge for making the highconcentration liquid formulation, since it usually increases withincreasing of protein concentration under the stressed conditions. FIG.4 shows the result of agitation study for a concentrated E26 liquidformulation. The formulation was prepared in 20 mM succinate, 192 mMtrehalose at pH 6.0 with different concentration of polysorbate 20. Theparticulate formulation was monitored by turbidity measurement. Theresult shows that the turbidity of E26 solution increases with agitationtime. The addition of at least 0.01% of polysorbate is essential forreducing the particulate formation under the stressed condition. Similarresults were also observed for concentrated E25 liquid formulation.

EXAMPLE 5

FIG. 5 shows the liquid formulation of 150 mg/ml E25 prepared byreconstitution of the lyophilized E25. Increasing of salt concentrationinhibits the reversible particulate formation and results in thereduction of turbidity reading. Among all the salts tested, theformulation with Arg-HCl appears to have the least turbidity. The effectof salt concentration on lowering the turbidity reading has also beenobserved for E25 prepared using a TFF process.

EXAMPLE 6

The liquid formulation of E25 in the presence of ArgHCl also appears tohave better stability than other liquid formulations. FIGS. 6 and 7 showthe stability study of E25 at 150 mg/ml in liquid formulation containingArgHCl, CaCl₂ and MgCl₂. For liquid formulations containing ArgHCl withor without sucrose, there is little difference in their stability interms of turbidity, isomerization and fragmentation. The liquidformulations containing ArgHCl are more stable than the formulationcontaining MgCl₂ and CaCl₂.

EXAMPLE 7

FIG. 8 shows the results of a stability study of E25 liquid formulationwith acetate and histidine formulations. The formulation with histidinehas higher pH than the acetate formulation. The results clearly showedthat the E25 in a histidine, ArgHCl liquid formulation are more stablethan under other conditions.

EXAMPLE 8

The high concentration of E25 can form a solid gel in the presence ofcertain ions, such as citrate, succinate and sulfate (table I),particularly at storage temperature of 2-8° C. Using arginine-HCl as anexcipient allows us to formulate E25 up to more than 200 mg/ml withoutgel or precipitate formation.

TABLE 1 Effect of various excipients on gelation of E25 at 125 mg/ml, pH~6.0 Excipient Turbidity Antibody Concen- at T0 Concen- Visual tration(340-360 tration Appear- Excipient MM Preparation nm) mg/ml ance SWFILyo Recon 0.21 125 Clear NaCl 188 Lyo Recon 0.25 125 Clear Succinate 94Lyo Recon 0.31 125 Gel Succinate 19 Lyo Recon 0.28 125 Gel Citcrate 188Lyo Recon Pending 125 Gel Citrate 19 Lyo Recon Pending 125 Gel Na₂SO₄Pending Lyo Recon Pending 125 Gel Na₂SO₄ Pending Lyo Recon Pending 125Opalescent Phosphate Pending Lyo Recon Pending 125 Opalescent Acetate188 Lyo Recon Pending 125 Clear Acetate 94 Lyo Recon Pending 125 ClearAcetate 19 Lyo Recon Pending 125 Clear Histidine 94 Lyo Recon 0.19 125Clear Histidine 47 Lyo Recon 0.24 125 Clear Arginine- 150 Lyo Recon 0.25137 Clear HCl Arginine- 200 TFF 0.19 162 Clear HCl Arginine- 150 LyoRecon 0.27 137 Gel SO₄ CaCl₂ 125 TFF 0.32 147 Clear MgCl₂ 125 TFF 0.48147 Opalescent

EXAMPLE 9 Expression of Protein or Antibody in E. coli

This example illustrates preparation of an unglycosylated form of adesired protein or antibody by recombinant expression in E. coli.

The DNA sequence encoding the desired protein or antibody is initiallyamplified using selected PCR primers. The primers should containrestriction enzyme sites which correspond to the restriction enzymesites on the selected expression vector. A variety of expression vectorsmay be employed. An example of a suitable vector is pBR322 (derived fromE. coli; see Bolivar et al., Gene, 2:95 (1977)) which contains genes forampicillin and tetracycline resistance. The vector is digested withrestriction enzyme and dephosphorylated. The PCR amplified sequences arethen ligated into the vector. The vector will preferably includesequences which encode for an antibiotic resistance gene, a trppromoter, a polyhis leader (including the first six STII codons, polyhissequence, and enterokinase cleavage site), the coding region of thedesired protein or antibody, lambda transcriptional terminator, and anargU gene. Additionally, the vector may include at least notinsignificant portions of the untranslated 5′ and 3′ sections of thenative sequence nucleic acid encoding the desired protein or antibody.

The ligation mixture is then used to transform a selected E. coli strainusing the methods described in Sambrook et al., supra. Transformants areidentified by their ability to grow on LB plates and antibioticresistant colonies are then selected. Plasmid DNA can be isolated andconfirmed by restriction analysis and DNA sequencing.

Selected clones can be grown overnight in liquid culture medium such asLB broth supplemented with antibiotics. The overnight culture maysubsequently be used to inoculate a larger scale culture. The cells arethen grown to a desired optical density, during which the expressionpromoter is turned on.

After culturing the cells for several more hours, the cells can beharvested by centrifugation. The cell pellet obtained by thecentrifugation can be solubilized using various agents known in the art,and the solubilized desired protein or antibody can then be purifiedusing a metal chelating column under conditions that allow tight bindingof the solubilized protein or antibody.

The desired protein or antiobdy may be expressed in E. coli in apoly-His tagged form, using the following procedure. The DNA encodingthe desired protein or antibody is initially amplified using selectedPCR primers. The primers will contain restriction enzyme sites whichcorrespond to the restriction enzyme sites on the selected expressionvector, and other useful sequences providing for efficient and reliabletranslation initiation, rapid purification on a metal chelation column,and proteolytic removal with enterokinase. The PCR-amplified, poly-Histagged sequences are then ligated into an expression vector, which isused to transform an E. coli host based on strain 52 (W3110 fuhA(tonA)Ion galE rpoHts(htpRts) clpP(lacIq). Transformants are first grown in LBcontaining 50 mg/ml carbenicillin at 30° C. with shaking until anO.D.600 of 3-5 is reached. Cultures are then diluted 50-100 fold intoCRAP media (prepared by mixing 3.57 g (NH₄)₂SO₄, 0.71 g sodiumcitrate.2H2O, 1.07 g KCl, 5.36 g Difco yeast extract, 5.36 g Sheffieldhycase SF in 500 mL water, as well as 110 mM MPOS, pH 7.3, 0.55% (w/v)glucose and 7 mM MgSO₄) and grown for approximately 20-30 hours at 30°C. with shaking. Samples are removed to verify expression by SDS-PAGEanalysis, and the bulk culture is centrifuged to pellet the cells. Cellpellets are frozen until purification and refolding.

E. coli paste from 0.5 to 1 L fermentations (6-10 g pellets) isresuspended in 10 volumes (w/v) in 7 M guanidine, 20 mM Tris, pH 8buffer. Solid sodium sulfite and sodium tetrathionate is added to makefinal concentrations of 0.1M and 0.02 M, respectively, and the solutionis stirred overnight at 4° C. This step results in a denatured proteinwith all cysteine residues blocked by sulfitolization. The solution iscentrifuged at 40,000 rpm in a Beckman Ultracentifuge for 30 mM. Thesupernatant is diluted with 3-5 volumes of metal chelate column buffer(6 M guanidine, 20 mM Tris, pH 7.4) and filtered through 0.22 micronfilters to clarify. The clarified extract is loaded onto a 5 ml QiagenNi-NTA metal chelate column equilibrated in the metal chelate columnbuffer. The column is washed with additional buffer containing 50 mMimidazole (Calbiochem, Utrol grade), pH 7.4. The protein is eluted withbuffer containing 250 mM imidazole. Fractions containing the desiredprotein are pooled and stored at 4° C. Protein concentration isestimated by its absorbance at 280 nm using the calculated extinctioncoefficient based on its amino acid sequence.

The proteins are refolded by diluting the sample slowly into freshlyprepared refolding buffer consisting of: 20 mM Tris, pH 8.6, 0.3 M NaCl,2.5 M urea, 5 mM cysteine, 20 mM glycine and 1 mM EDTA. Refoldingvolumes are chosen so that the final protein concentration is between 50to 100 micrograms/ml. The refolding solution is stirred gently at 4° C.for 12-36 hours. The refolding reaction is quenched by the addition ofTFA to a final concentration of 0.4% (pH of approximately 3). Beforefurther purification of the protein, the solution is filtered through a0.22 micron filter and acetonitrile is added to 2-10% finalconcentration. The refolded protein is chromatographed on a Poros RUHreversed phase column using a mobile buffer of 0.1% TFA with elutionwith a gradient of acetonitrile from 10 to 80%. Aliquots of fractionswith A280 absorbance are analyzed on SDS polyacrylamide gels andfractions containing homogeneous refolded protein are pooled. Generally,the properly refolded species of most proteins are eluted at the lowestconcentrations of acetonitrile since those species are the most compactwith their hydrophobic interiors shielded from interaction with thereversed, phase resin. Aggregated species are usually eluted at higheracetonitrile concentrations. In addition to resolving misfolded forms ofproteins from the desired form, the reversed phase step also removesendotoxin from the samples.

Fractions containing the folded desired protein or antibody are pooledand the acetonitrile removed using a gentle stream of nitrogen directedat the solution. Proteins are formulated into 20 mM Hepes, pH 6.8 with0.14 M sodium chloride and 4% mannitol by dialysis or by gel filtrationusing G25 Superfine (Pharmacia) resins equilibrated in the formulationbuffer and sterile filtered.

EXAMPLE 10 Expression of Protein or Antibody in Mammalian Cells

This example illustrates preparation of a potentially glycosylated formsof the desired protein or antibody by recombinant expression inmammalian cells.

The vector, pRK5 (see EP 307,247, published Mar. 15, 1989), is employedas the expression vector. Optionally, DNA encoding the desired proteinor antibody is ligated into pRK5 with selected restriction enzymes toallow insertion such DNA using ligation methods such as described inSambrook et al., supra.

In one embodiment, the selected host cells may be 293 cells. Human 293cells (ATCC CCL 1573) are grown to confluence in tissue culture platesin medium such as DMEM supplemented with fetal calf serum andoptionally, nutrient components and/or antibiotics. About 10 μg if DNAencoding the desired protein or antibody ligated into pRK5 is mixed withabout 1 μg DNA encoding the VA RNA gene [Thimmappaya et al., Cell,31:543 (1982)] and dissolved in 500 μl of 1 mM Tris-HCl, 0.1 mM EDTA,0.227 M CaCl₂. To this mixture is added, dropwise, 500 μl of 50 mM HEPES(pH 7.35), 280 mM NaCl, 1.5 mM NaPO₄, and a precipitate is allowed toform for 10 minutes at 25° C. The precipitate is suspended and added tothe 293 cells and allowed to settle for about four hours at 37° C. Theculture medium is aspirated off and 2 ml of 20% glycerol in PBS is addedfor 30 seconds. The 293 cells are then washed with serum free medium,fresh medium is added and the cells are incubated for about 5 days.

Approximately 24 hours after the transfections, the culture medium isremoved and replaced with culture medium (alone) or culture mediumcontaining 200 μCi/ml ³⁵S-cysteine and 200 pEi/ml ³⁵S-methionine. Aftera 12 hour incubation, the conditioned medium is collected, concentratedon a spin filter, and loaded onto a 15% SDS gel. The processed gel maybe dried and exposed to film for a selected period of time to reveal thepresence of the desired protein or antibody. The cultures containingtransfected cells may undergo further incubation (in serum free medium)and the medium is tested in selected bioassays.

In an alternative technique, the desired protein or antibody may beintroduced into 293 cells transiently using the dextran sulfate methoddescribed by Somparyrac et al., Proc. Natl. Acad. Sci., 12:7575 (1981).293 cells are grown to maximal density in a spinner flask and 700 μg DNAencoding the desired protein or antibody ligated into pRK5 is added. Thecells are first concentrated from the spinner flask by centrifugationand washed with PBS. The DNA-dextran precipitate is incubated on thecell pellet for four hours. The cells are treated with 20% glycerol for90 seconds, washed with tissue culture medium, and re-introduced intothe spinner flask containing tissue culture medium, 5 μg/ml bovineinsulin and 0.1 μg/ml bovine transferrin. After about four days, theconditioned media is centrifuged and filtered to remove cells anddebris. The sample containing the expressed desired protein or antibodycan then be concentrated and purified by any selected method, such asdialysis and/or column chromatography.

In another embodiment, the desired protein or antibody can be expressedin CHO cells. The DNA encoding the desired protein or antibody ligatedinto pRK5 can be transfected into CHO cells using known reagents such asCaPO₄ or DEAE-dextran. As described above, the cell cultures can beincubated, and the medium replaced with culture medium (alone) or mediumcontaining a radiolabel such as ³⁵S-methionine. After determining thepresence of the desired protein or antibody, the culture medium may bereplaced with serum free medium. Preferably, the cultures are incubatedfor about 6 days, and then the conditioned medium is harvested. Themedium containing the expressed desired protein or antiobody can then beconcentrated and purified by any selected method.

Epitope-tagged variants of the desired protein or antibody may also beexpressed in host CHO cells. The DNA encoding the desired protein orantibody ligated into pRK5 may be subcloned out of the pRK5 vector. Thesubclone insert can undergo PCR to fuse in frame with a selected epitopetag such as a poly-his tag into a Baculovirus expression vector. Thepoly-his tagged DNA encoding the desired protein or antibody insert canthen be subcloned into a SV40 driven vector containing a selectionmarker such as DHFR for selection of stable clones. Finally, the CHOcells can be transfected (as described above) with the SV40 drivenvector. Labeling may be performed, as described above, to verifyexpression. The culture medium containing the expressed poly-His taggeddesired protein or antibody can then be concentrated and purified by anyselected method, such as by Ni²⁺-chelate affinity chromatography.

The desired protein or antibody may also be expressed in CHO and/or COScells by a transient expression procedure or in CHO cells by anotherstable expression procedure.

Stable expression in CHO cells is performed using the followingprocedure. The proteins are expressed as an IgG construct(immunoadhesin), in which the coding sequences for the soluble forms(e.g. extracellular domains), of the respective proteins are fused to anIgG1 constant region sequence containing the hinge, CH2 and CH2 domainsand/or is a poly-His tagged form.

Following PCR amplification, the respective DNAs are subcloned in a CHOexpression vector using standard techniques as described in Ausubel etal., Current Protocols of Molecular Biology, Unit 3.16, John Wiley andSons (1997). CHO expression vectors are constructed to have compatiblerestriction sites 5′ and 3′ of the DNA of interest to allow theconvenient shuttling of cDNA's. The vector used expression in CHO cellsis as described in Lucas et al., Nucl. Acids Res. 24:9 (1774-1779(1996), and uses the SV40 early promoter/enhancer to drive expression ofthe cDNA of interest and dihydrofolate reductase (DHFR). DHFR expressionpermits selection for stable maintenance of the plasmid followingtransfection.

Twelve micrograms of the desired plasmid DNA is introduced intoapproximately 10 million CHO cells using commercially availabletransfection reagents Superfect® (Quiagen), Dosper® or Fugene®(Boehringer Mannheim). The cells are grown as described in Lucas et al.,supra. Approximately 3×10⁻⁷ cells are frozen in an ampule for furthergrowth and production as described below.

The ampules containing the plasmid DNA are thawed by placement intowater bath and mixed by vortexing. The contents are pipetted into acentrifuge tube containing 10 mLs of media and centrifuged at 1000 rpmfor 5 minutes. The supernatant is aspirated and the cells areresuspended in 10 mL of selective media (0.2 μm filtered PS20 with 5%0.2 μm diafiltered fetal bovine serum). The cells are then aliquotedinto a 100 mL spinner containing 90 mL of selective media. After 1-2days, the cells are transferred into a 250 mL spinner filled with 150 mLselective growth medium and incubated at 37° C. After another 2-3 days,250 mL, 500 mL and 2000 mL spinners are seeded with 3×10⁵ cells/mL. Thecell media is exchanged with fresh media by centrifugation andresuspension in production medium. Although any suitable CHO media maybe employed, a production medium described in U.S. Pat. No. 5,122,469,issued Jun. 16, 1992 may actually be used. A 3 L production spinner isseeded at 1.2×10⁶ cells/mL. On day 0, the cell number and pH isdetermined. On day 1, the spinner is sampled and sparging with filteredair is commenced. On day 2, the spinner is sampled, the temperatureshifted to 33° C., and 30 mL of 500 g/L glucose and 0.6 mL of 10%antifoam (e.g., 35% polydimethylsiloxane emulsion, Dow Corning 365Medical Grade Emulsion) taken. Throughout the production, the pH isadjusted as necessary to keep it at around 7.2. After 10 days, or untilthe viability dropped below 70%, the cell culture is harvested bycentrifugation and filtering through a 0.22 μm filter. The filtrate waseither stored at 4° C. or immediately loaded onto columns forpurification.

For the poly-His tagged constructs, the proteins are purified using aNi-NTA column (Qiagen). Before purification, imidazole is added to theconditioned media to a concentration of 5 mM. The conditioned media ispumped onto a 6 ml Ni-NTA column equilibrated at 4° C., in 20 mM Hepes,pH 7.4, buffer containing 0.3 M NaCl and 5 mM imidazole at a flow rateof 4-5 ml/min. After loading, the column is washed with additionalequilibration buffer and the protein eluted with equilibration buffercontaining 0.25 M imidazole. The highly purified protein is subsequentlydesalted into a storage buffer containing 10 mM Hepes, 0.14 M NaCl and4% mannitol, pH 6.8, with a 25 ml G25 Superfine (Pharmacia) column andstored at −80° C.

Immunoadhesin (Fc-containing) constructs are purified from theconditioned media as follows. The conditioned medium is pumped onto a 5ml Protein A column (Pharmacia) which had been equilibrated in 20 mM Naphosphate buffer, pH 6.8. After loading, the column is washedextensively with equilibration buffer before elution with 100 mM citricacid, pH 3.5. The eluted protein is immediately neutralized bycollecting 1 ml fractions into tubes containing 275 μL, of 1 M Trisbuffer, pH 9. The highly purified protein is subsequently desalted intostorage buffer as described above for the poly-His tagged proteins. Thehomogeneity is assessed by SDS polyacrylamide gels and by N-terminalamino acid sequencing by Edman degradation.

EXAMPLE 11 Expression of Protein or Antibodies in Yeast

The following method describes recombinant expression of the desiredprotein or antibody in yeast.

First, yeast expression vectors are constructed for intracellularproduction or secretion of the desired protein or antibody from theADH2/GAPDH promoter. DNA encoding desired protein or antibody and thepromoter is inserted into suitable restriction enzyme sites in theselected plasmid in order to direct intracellular expression. Forsecretion, DNA encoding the desired protein or antibody can be clonedinto the selected plasmid, together with DNA encoding the ADH2/GAPDHpromoter, a native signal peptide or other mammalian signal peptide, or,for example, a yeast alpha-factor or invertase secretory siglnal/leadersequence, and linker sequences (if needed) for expression of the desiredprotein or antibody.

Yeast cells, such as yeast strain AB110, can then be transformed withthe expression plasmids described above and cultured in selectedfermentation media. The transformed yeast supernatants can be analyzedby precipitation with 10% trichloroacetic acid and separation bySDS-PAGE, followed by staining of the gels with Coomassie Blue stain.

The recombinant protein or antibody can subsequently be isolated andpurified by removing the yeast cells from the fermentation medium bycentrifugation and then concentrating the medium using selectedcartridge filters. The concentrate containing the recombinant protein orantibody may further be purified using selected column chromatographyresins.

EXAMPLE 12 Expression of the Protein or Antibody in Baculovirus-InfectedInsect Cells

The following method describes recombinant expression of the desiredprotein or antibody in Baculovirus-infected insect cells.

The sequence coding for the desired protein or antibody is fusedupstream of an epitope tag contained within a baculovirus expressionvector. Such epitope tags include poly-his tags and immunoglobulin tags(like Fc regions of IgG). A variety of plasmids may be employed,including plasmids derived from commercially available plasmids such aspVL1393 (Novagen). Briefly, the sequence encoding the desired portion ofthe protein or antibody, such as the sequence encoding the extracellulardomain of a transmembrane protein or the sequence encoding the matureprotein if the protein is extracellular is amplified by PCR with primerscomplementary to the 5′ and 3′ regions. The 5′ primer may incorporateflanking (selected) restriction enzyme sites. The product is thendigested with those selected restriction enzymes and subcloned into theexpression vector.

Recombinant baculovirus is generated by co-transfecting the aboveplasmid and BaculoGold™ virus DNA (Pharmingen) into Spodopterafrugiperda (“Sf9”) cells (ATCC CRL 1711) using lipofectin (commerciallyavailable from GIBCO-BRL). After 4-5 days of incubation at 28° C., thereleased viruses are harvested and used for further amplifications.Viral infection and protein expression are performed as described byOReilley et al., Baculovirus expression vectors: A Laboratory Manual,Oxford: Oxford University Press (1994).

Expressed poly-his tagged protein or antibody can then be purified, forexample, by Ni²⁺-chelate affinity chromatography as follows. Extractsare prepared from recombinant virus-infected Sf9 cells as described byRupert et al., Nature, 362:175-179 (1993). Briefly, Sf9 cells arewashed, resuspended in sonication buffer (25 mL Hepes, pH 7.9; 12.5 mMMgCl₂; 0.1 mM EDTA; 10% glycerol; 0.1% NP-40; 0.4 M KCl), and sonicatedtwice for 20 seconds on ice. The sonicates are cleared bycentrifugation, and the supernatant is diluted 50-fold in loading buffer(50 mM phosphate, 300 mM NaCl, 10% glycerol, pH 7.8) and filteredthrough a 0.45 μm filter. A Ni²⁺-NTA agarose column (commerciallyavailable from Qiagen) is prepared with a bed volume of 5 mL, washedwith 25 mL of water and equilibrated with 25 mL of loading buffer. Thefiltered cell extract is loaded onto the column at 0.5 mL per minute.The column is washed to baseline A₂₈₀ with loading buffer, at whichpoint fraction collection is started. Next, the column is washed with asecondary wash buffer (50 mM phosphate; 300 mM NaCl, 10% glycerol, pH6.0), which elutes nonspecifically bound protein. After reaching A₂₈₀baseline again, the column is developed with a 0 to 500 mM Imidazolegradient in the secondary wash buffer. One mL fractions are collectedand analyzed by SDS-PAGE and silver staining or Western blot withNi²⁺-NTA-conjugated to alkaline phosphatase (Qiagen). Fractionscontaining the eluted His₁₀-tagged protein or antibody are pooled anddialyzed against loading buffer.

Alternatively, purification of the IgG tagged (or Fc tagged) protein orantibody can be performed using known chromatography techniques,including for instance, Protein A or protein G column chromatography.

EXAMPLE 13 Preparation of Antibodies

This example illustrates preparation of monoclonal antibodies which canspecifically bind the protein of interest or the desired antigen.

Techniques for producing the monoclonal antibodies are known in the artand are described, for instance, in Goding, supra. Immunogens that maybe employed include purified desired protein or target antibody, fusionproteins containing the desired protein or target antigen, and cellsexpressing such recombinant protein or antigen on the cell surface.Selection of the immunogen can be made by the skilled artisan withoutundue experimentation.

Mice, such as Balb/c, are immunized with the desired protein or targetantigen immunogen emulsified in complete Freund's adjuvant and injectedsubcutaneously or intraperitoneally in an amount from 1-100 micrograms.Alternatively, the immunogen is emulsified in MPL-TDM adjuvant (RibiImmunochemical Research, Hamilton, Mont.) and injected into the animal'shind foot pads. The immunized mice are then boosted 10 to 12 days laterwith additional immunogen emulsified in the selected adjuvant.Thereafter, for several weeks, the mice may also be boosted withadditional immunization injections. Serum samples may be periodicallyobtained from the mice by retro-orbital bleeding for testing in ELISAassays to detect antibodies direct to the desired protein or antigen.

After a suitable antibody titer has been detected, the animals“positive” for antibodies can be injected with a final intravenousinjection of the desired protein or target antigen. Three to four dayslater, the mice are sacrificed and the spleen cells are harvested. Thespleen cells are then fused (using 35% polyethylene glycol) to aselected murine myeloma cell line such as P3X63AgU.1, available fromATCC, No. CRL 1597. The fusions generate hybridoma cells which can thenbe plated in 96 well tissue culture plates containing HAT (hypoxanthine,aminopterin, and thymidine) medium to inhibit proliferation of non-fusedcells, myeloma hybrids, and spleen cell hybrids.

The hybridoma cells will be screened in an ELISA for reactivity againstthe desired protein or target antigen. Determination of “positive”hybridoma cells secreting the such monoclonal antibodies is within theskill in the art.

The positive hybridoma cells can be injected intraperitoneally intosyngeneic Balb/c mice to produce ascites containing such monoclonalantibodies. Alternatively, the hybridoma cells can be grown in tissueculture flasks or roller bottles. Purification of the monoclonalantibodies produced in the ascites can be accomplished using ammoniumsulfate precipitation, followed by gel exclusion chromatography.Alternatively, affinity chromatography based upon binding of antibody toprotein A or protein G can be employed.

EXAMPLE 14 Purification of the Desired Protein Using Specific Antibodies

The desired protein, in either native or recombinant form, may bepurified by a variety of standard techniques in the art of proteinpurification. For example, pro-polypeptide, mature polypeptide, orpre-polypeptide forms of the desired protein may be purified byimmunoaffinity chromatography using antibodies specific fora the desiredprotein. In general, an immunoaffinity column is constructed bycovalently coupling the antibody that specifically binds the desiredprotein to an activated chromatographic resin.

Polyclonal immunoglobulins are prepared from immune sera either byprecipitation with ammonium sulfate or by purification on immobilizedProtein A (Pharmacia LKB Biotechnology, Piscataway, N.J.). Likewise,monoclonal antibodies are prepared from mouse ascites fluid by ammoniumsulfate precipitation or chromatography on immobilized Protein A.Partially purified immunoglobulin is covalently attached to achromatographic resin such as CnBr-activated SEPHAROSE™ (Pharmacia LKBBiotechnology). The antibody is coupled to the resin, the resin isblocked, and the derivative resin is washed according to themanufacturer's instructions.

Such an immunoaffinity column is utilized in the purification of thedesired protein by preparing a fraction from cells expressing it in asoluble form. This preparation is derived by solubilization of the wholecell or of a subcellular fraction obtained via differentialcentrifugation by the addition of detergent or by other methods wellknown in the art. Alternatively, soluble protein containing a signalsequence may be secreted in useful quantity into the medium in which thecells are grown.

The solublized preparation containing the desired protein is passed overthe immunoaffinity column, and the column is washed under conditionsthat allow the preferential absorbance of the desired protein (e.g.,high ionic strength buffers in the presence of detergent). Then, thecolumn is eluted under conditions that disrupt antibody to proteinbinding (e.g., a low pH buffer such as approximately pH 2-3, or a highconcentration of a chaotrope such as urea or thiocyanate ion), and thedesire protein is then collected.

What is claimed is:
 1. A stable, liquid formulation of low turbiditycomprising (a) an anti-IgE antibody in an amount of about 150 mg/ml, (b)arginine-HCl in an amount of 200 mM, (c) histidine in an amount of 20mM, and (d) polysorbate in an amount of 0.01 to 0.1%, and where theformulation further has a pH of 6.0; wherein the anti-IgE antibodycomprises a light chain comprising the amino acid sequence of SEQ IDNO:1 and a heavy chain comprising the amino acid sequence of SEQ IDNO:4.
 2. An article of manufacture comprising a container enclosing astable, liquid formulation of low turbidity comprising (a) an anti-IgEantibody in an amount of about 150 mg/ml, (b) arginine-HCl in an amountof 200 mM, (c) histidine in an amount of 20 mM, and (d) polysorbate inan amount of 0.01 to 0.1%, and where the formulation further has a pH of6.0; wherein the anti-IgE antibody comprises a light chain comprisingthe amino acid sequence of SEQ ID NO:1 and a heavy chain comprising theamino acid sequence of SEQ ID NO:4.
 3. The article of manufacture ofclaim 2, wherein the container is a syringe.
 4. The article ofmanufacture of claim 3, wherein the syringe is further contained withinan injection device.
 5. The article of manufacture of claim 4, whereinthe injection device is an auto-injector.
 6. A stable, liquidformulation of low turbidity comprising (a) an anti-IgE antibody in anamount of about 150 mg/ml, (b) arginine-HCl in an amount of 200 mM, (c)histidine in an amount of 20 mM, and (d) polysorbate in an amount of0.01 to 0.1%, and where the formulation further has a pH of 6.0; whereinthe anti-IgE antibody is produced by a method comprising (1) culturingcells transformed or transfected with a vector containing nucleic acidencoding an antibody comprising a light chain comprising the amino acidsequence of SEQ ID NO:1 and a heavy chain comprising the amino acidsequence of SEQ ID NO:4, and (2) purifying the antibody produced by thecells.
 7. The formulation of claim 6 wherein the cells are mammaliancells.
 8. The formulation of claim 7, wherein the mammalian cells areChinese hamster ovary cells.
 9. An article of manufacture comprising acontainer enclosing a stable, liquid formulation of low turbiditycomprising (a) an anti-IgE antibody in an amount of about 150 mg/ml, (b)arginine-HCl in an amount of 200 mM, (c) histidine in an amount of 20mM, and (d) polysorbate in an amount of 0.01 to 0.1%, and where theformulation further has a pH of 6.0; wherein the anti-IgE antibody isproduced by a method comprising (1) culturing cells transformed ortransfected with a vector containing nucleic acid encoding an antibodycomprising a light chain comprising the amino acid sequence of SEQ IDNO:1 and a heavy chain comprising the amino acid sequence of SEQ IDNO:4, and (2) purifying the antibody produced by the cells.
 10. Thearticle of manufacture of claim 9, wherein the cells are mammaliancells.
 11. The article of manufacture of claim 10, wherein the mammaliancells are Chinese hamster ovary cells.
 12. The article of manufacture ofclaim 9, wherein the container is a syringe.
 13. The article ofmanufacture of claim 12, wherein the syringe is further contained withinan injection device.
 14. The article of manufacture of claim 13, whereinthe injection device is an auto-injector.